The act of quickly inserting one’s index finger into the top of another’s butt crack which is exposed above the pant waistline. It is often exclaimed when the act is performed.
Girlfriend: “Boop!” <boops boyfriend working on car>
Boyfriend: <hits head on open hood of car> “Stop booping me!”
Boyfriend: <hits head on open hood of car> “Stop booping me!”
by BloodOftheHolyMammal July 28, 2022
 Get the Boopmug.
Get the Boopmug. by CHOP STICK February 20, 2024
 Get the Boopmug.
Get the Boopmug. by Gabe’s Papa October 23, 2024
 Get the Boopingmug.
Get the Boopingmug. by Bananabox May 30, 2021
 Get the foofy boopmug.
Get the foofy boopmug. by WO-CREW January 20, 2017
 Get the Draggin' a Boopmug.
Get the Draggin' a Boopmug. by Boopboi November 6, 2019
 Get the Boopmug.
Get the Boopmug. The act of lining Cocaine in another's butt Crack and then snorting it.
Man 1: dude wanna Fong Boop?
Man 2: it's the best way to get high Man
Man 1: dude wanna Fong Boop?
Man 2: it's the best way to get high Man
by Plaeg November 18, 2021
 Get the Fong Boopmug.
Get the Fong Boopmug.