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Jack ones finger into the vagina or anus of a female counterpart. Hopefully while she is drunk or passed out.
I took home a nasty skank from Casey's Bar last night, and proceeded to fingerjack the drunk bitch while she slept in the passenger seat.
by The Heeb December 17, 2008
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When a man bends over and masterbates fastly while someone else fingers him with 2 fingers from behind and rubs his testicles.
Sarah: "I'm so embarrassed! I walked in on my parents doing the finger jack."

Mark: "That really sucks.."
by poopyodj June 21, 2010
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