When methane gas is released from your ass.
"My friend Justin flatuates on a regular bases, and since he's a firecrotch, ignites everything."
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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!
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She's giving you head, you take your dick out of her mouth, fart in her face and end the relationship on the spot.
I was so sick of her so I gave her a Franklin Fellatio Flatuation Breakup (FFFB) and got out of there