I didn't write these, they are from http://wiki.illemonati.com.
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G7 C7 Eb7 G7
Eb Gm7 C Bb 
VERSE: 
G (320003@1)        
The breeze is a-blowin'
               C (x32010@1)        Eb (x43121@3)    GThe (320003@1)grass just won't stop growin'
(G)
So I'd better do somethin' soon
      C (x32010@1)       Eb (x43121@3)      GGonna (320003@1)spend the afternoon

CHORUS 1:
GMowin' (320003@1)the lawn, mowin' the lawn
                C (x32010@1)        Eb (x43121@3) GMowin' (320003@1)the lawn, mowin' the lawn
(G)
Mowin' the lawn, mowin' the lawn
                C (x32010@1)        Eb (x43121@3) GMowin' (320003@1)the lawn, mowin' the lawn 

CHORUS 2: 
G7Lawnmower! (320001@1)Rev it up good now,
           C (x32010@1)           Eb (x43121@3)        
Lawnmower! Listen to the sound, hey
G7Lawnmower! (320001@1)Rev it up, take it on
Eb (x43121@3)  Gm (355333@1)               Cdown, (x32010@1)take it all around town 
       Bb (x1333x@1)        GLet (320003@1)me hear y'all: 

INSTRUMENTAL:
G (320003@1)G C Eb
G (320003@1)G C Eb

CODA:
G (320003@1)         CEb
Lawnmower 
G (320003@1)         CEb
Lawnmower