Top Definition
when two people assume the positions of "69" oral sex play, but instead of engaging in sexual activity, they fart in each other's faces.
john wasn't too happy when sally refused to fartsty-nine him.

We totally did a fartsty-niner last night.

You may not fartsty-nine with minors. Or miners.
by igrldremer November 18, 2006
5 Words related to fartsty-nine

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