look up any word, like plopping:
 
1.
(vb) to break or pass wind; to expel air through one's anus; to chuff; to whistle through one's Y-fronts; to let Polly out of prison; to drop one; to let go.....
Aaaaaaaagh! That MINGS! Our Mark's just stepped on a frog- again!!...

Chalky leaned casually forward from the sofa, picked up the remote; and stepped blithely on a frog. He chuckled and intoned 'Beat THAT!!'
by Blueboy May 07, 2004
 
2.
A polite excuse for blasting a fart.

Compare with step on a duck.
POOOOT! Oh, excuse me ladies, I just stepped on a frog.
by Cap'n Bullmoose May 12, 2005