Country Dictionary

v)
During vaginal intercourse, most usually from the rear, when the penis slips out of the vagina and upon attempted reinsertion, instead pokes the cheek of the buttocks.

Everything was going fine 'till I boinked her. That shit hurts.

to have sexual intercourse
not considered offensive enough to be censored from network TV
The OED dates boink as a verb back to 1984, citing Stephen King's "Thinner," where it appears to be used as onomatopoeia, similar to bonk: "He half-expected them to begin bopping and boinking each other."
This precedes usage in the 1985 episode of "Moonlighting" titled "The Next Murder You Hear."

David: It makes you crazy to think that anybody out there is boinking when you can’t.
Maddie: I can't hear you.

Used by the geeky guy in the film Road Trip. To have sex with someone.

Man, i boinked her good!

to throw out a holler at a chik when she walk by ...often say when u see a good lookin peice of ass...but say with full cockiness and a daaaaamn placed in front!

..nore rocked this on paper soldiers too.. daaayum isha boink boink.. when i saw that girl i was like isha boink boink i didnt even care if she heard it or not....

To inhale or "hit" an unlit blunt, to check the pull and taste of it. This can also be done with a cigarette, pipe, or bong, but serves no purpose.

Dude, boink this cig its a peppermint patty.

a synonym for boner, stiffy or woody,etc.

Girl: nice boink!
Guy: (Blushes and looks down his pants.

a slang term to describe having sex with a female thats irrestibly bangable
or just sex.

DUDE!!! i heard my mum + dad having sha-boink-boink last night!!

damn! that girls sha-boink-able.