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1.
When you release a toot toot into the potty or wherever you are located. Preferably into the potty...

Jacob Fartpants sure has to flatuate a lot!
by Cincodemayobetch November 29, 2007
 
2.
When methane gas is released from your ass.
"My friend Justin flatuates on a regular bases, and since he's a firecrotch, ignites everything."
by aliencj June 29, 2006