Funny you should ask, just got done today mixing a song I wrote awhile back. For the fart sound we used a synth tuba down an octave or so. Had a nice bark to it.
FART IN A WHIRLWIND Penn 81 Y- 46
ch) Like a fart in a whirlwind, our love is undisciplined
Not a chance in where its going, but knowing where its been
Like a fart in a whirlwind
Heard about the things you say, well write it down in white and black
If you don’t like the love I give you, then I’d like to have it back
There’s girls you learn to know in school, and ones you see in town
There’s girls you meet walking the street, but you just bring me down
Your man you say is handsome, such a sexy one to see
That don’t comply to my description, then the man you love ain’t me
Now we ever came together, I’m not the one to know
Seems were courting a disaster, always out of our control