I'm sure this isn't the 'legit-legit' way to play it, but it's fun to play it like 
this for me, at least.
And as far as strumming goes, I usually just go -down- once for the verses, then -
down--down- for the chorus, but whatever works for you, really.

STANDARD TUNING (capo 1)

(("Now usually I don't do this, but uh, go head on and break 'em off with a lil' 
bit of a preview of the remix"))

VERSE 1
            GNow (320003@1)I ain't tryin' to be rude,
               C (x32010@1)                   BmBut (x24432@1)hey pretty girl, I'm feelin' you,
            AmThe (x02210@1)way you do the things you do,
              D7Reminds (xx0212@1)me of my Lexus-Coup
               GThat's (320003@1)why I'm all up in yo' grill,
                  C (x32010@1)        BmTryin' (x24432@1)to get you to a hotel,
              AmYou (x02210@1)must be a football coach,
            D7The (xx0212@1)way you got me playin' the field

PRE-CHORUS
               GSo (320003@1)gimme' that toot-toot,
                    C (x32010@1)      BmLemme (x24432@1)give you that beep-beep
            AmRunnin' (x02210@1)her hands through my 'fro,
         D7Bouncin' (xx0212@1)on 24's
           D7While (xx0212@1)they say on the radio

CHORUS
           GIt's (320003@1)the remix to Ignition
       C (x32010@1)           BmHot (x24432@1)'n fresh out the kitchen
     AmMama (x02210@1)rollin' that body,
          D7Got (xx0212@1)every man in here wishin',
        GSippin' (320003@1)on Coke and rum,
          C (x32010@1)              BmI'm (x24432@1)like, so what I'm drunk
         AmIt's (x02210@1)the freakin' weekend, 
                  D7Baby (xx0212@1)I'm about to have me some fun, singin'
G (320003@1)                    C (x32010@1)            Bm (x24432@1)Bounce-bounce, bounce-bounce, bounce-bounce, bounce,
Am (x02210@1)                  D7 (xx0212@1)Bounce-bounce, bounce...

VERSE 2
               GNow (320003@1)it's like "Murder She Wrote"
       C (x32010@1)                     BmOnce (x24432@1)I get you out 'dem clothes,
     AmPrivacy (x02210@1)is on the door,
                   D7But (xx0212@1)still they can hear you screamin' "more!",
         GGirl (320003@1)I'm feelin' what'cha feelin,
        C (x32010@1)               BmNo (x24432@1)more hopin' and wishin',
             AmI'm (x02210@1)about to take my key,
                D7And (xx0212@1)stick it in the ignition,

(PRE-CHORUS REPREATS)

(CHORUS REPEATS)

BRIDGE
G (320003@1)                    C (x32010@1)         BmCrystal (x24432@1)poppin' in the stretch navigator,
       Am (x02210@1)                       D7We (xx0212@1)got food everywhere, as if the party was catered,
       GWe (320003@1)got fellas to my left,
C (x32010@1)           BmHonnies (x24432@1)on my right,
   Am (x02210@1)                          D7We (xx0212@1)put 'em both together, we got drinkin' all night
    G (320003@1)                     C (x32010@1)        BmAnd (x24432@1)after the show it's the after party
    Am (x02210@1)                      D7And (xx0212@1)after the party, it's the hotel lobby
     G (320003@1)                      C (x32010@1)            BmAnd (x24432@1)'round about 4, you gotta clear the lobby
     Am (x02210@1)                      D7Then (xx0212@1)take it to your room and **** somebody

(PRE-CHORUS REPEATS)

(CHORUS REPEATS)

OUTRO
G (320003@1)We be off in this Jeep
C (x32010@1)      Bm (x24432@1)      Am (x02210@1)Foggin' windows up 
             D7Blastin' (xx0212@1)the radio
       GIn (320003@1)the back of my truck
         GBouncin' (320003@1)up and down
          C (x32010@1)       BmStroke (x24432@1)it round and round
       AmTo (x02210@1)the remix,
        D7 (xx0212@1)            GWe (320003@1)just thuggin' it out.