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Noun: One who gives commitment to a group activity and flakes; bad with planning; indecisive when explaining their availability to his or her peers.
Brian said he would come to the beach, now he’s not responding to texts; Brian is a capper

Ethan planned with to see a movie with the group, but says his mom wouldn’t let him go; Ethan is a capper
capper by arump June 20, 2019
An insult that Implies that a person who's thinking or thought process is low and their maximum ability to think is still low.
He is an absolute capper
capper by thegoldenbeetle July 8, 2019
A person who always lies about getting jumped and dating a girl, even though we all know it’s just his stepsister
Jim is a capper
Capper by Villa_jah October 15, 2019
some one who is being kinda homo
When that guy just got a seizure, he was being a capper!
Capper by Mcfoebapcap October 22, 2019
Person 1: "Oh, Syed said he'd come to workouts today"
Person 2: " hahaha that's hilarious, he's such a capper"
*Person 1 and 2 laugh for the next 30 minutes*
Capper by this man a capper August 8, 2021
wanting big dick because you are gay, if your a boy of course. or “big dick sucker” or “big dick rider
me:”hey look its martin the capper!!”
capper by usgegsuwhe November 1, 2021