Top Definition
When a girl jerks off a guy while he rubs her vagina. The reason why it is called FapiX is because when they sit on a couch and FapiX, their arms cross, thus creating an X.
K: Hey, you know what's hot?
M: You?
K: Other than me?
M: ..... (weird face !@#$)
K: When them couples do fapiX
by Keremanda December 25, 2011

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