When someone has sex with a mentally challenged person, largely out of pity or mercy.
Anna: I can't believe Becky had sex with a guy from the special ed class.

Carla: I know. That was a total "Forrest Hump."
by Robert Sacamano October 11, 2013
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(v.) To relentlessly have sex with someone, as an analogy of the well-known scene in Forrest Gump where the main character runs across the US without having a break.
Person 1: Hey babe, I'm feeling so horny today that I think I could Forrest Hump you all night long, what you think?
Person 2: Fuck off!
by ilsa chinaski June 1, 2017
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(n.) High sex driven person who is capable of having a nearly endless sexual session without feeling tired
"Hey, I've heard that geeky nerdy weirdo from Maths class is such a Forrest Hump.. who would've thought right?!"
by ilsa chinaski June 1, 2017
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When you cut the shit, skip the foreplay and go straight to dry humping completely naked.
The Penis must come into direct contact with the vagina but CANNOT enter otherwise it's just sex.
It ends when either party gets bored or friction becomes too painful to bare (either way it's fucking lit)
Emily: "Oh yeah Callum go down on me"
Callum: "No No No, I'm only about The Forrest Hump"
Emily: "Go on then baby, grab my leg and rub me raw"
by Dr.Y .Humpfries January 6, 2019
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