Top Definition
A sexual act in which the man in a doggy style position kicks the woman as hard as he can in the behind, causing her to do a complete front flip. Please note that it is only considered an "atomic four-wheeler" when the woman does a complete frontal flip.
My girlfriend and I were having sex, and I gave her an atomic four-wheeler. She almost killed me later.
by Recipe4Disasta October 30, 2011

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