It is usually used in GAY COMMUNITY, it means a man who likes to take the butt virginity of another man. Because when your butt is first penateated your balls shrink to marble size.

It also means a sex act when a fellow is into bondage and being tied up or enjoys tying men up he is called a marble collector.
Make sure to wear a condom, Brad is into collecting marbles
by NobodyYouKnow808 October 25, 2022
Get the collecting marbles mug.
A marble collector, is a man who enjoys taking the butt virginity, of other men. The term marble collecting, has been used in the gay community, for many years. A lot of men who are not all the way out of the closet, yet wish to let it be know to gay community, that they are indeed homosexual, will list 1 of there hobbies as marble collecting! Therefore it is also a inside joke in gay community to signify your gay!
Mack claims he isn't gay, but he has marble collecting listed as a hobby. (Winkwink)
by NobodyYouKnow808 October 25, 2022
Get the Marble Collecting mug.
A term used in gay community to describe a guy who likes to get his ass fucked and cummed inside of. T
he act of 2 guys fucking another guy in his ass, and bust a nut in his ass causing there semen tomix and look like a marble. So a marble collector is used to describe the guy that gets fucked in his ass. Thus a marble collector is a guy who enjoys getting marbled.

MARBLE COLLECTING OR COLLECTOR- is a derogatory term used to describe a man who is "MACABRE, creepy, annoying, bitter, malicious, vindictive, dire, desperate, evil.
I" 1.) Ive been out "MARBLE COLLECTING" all night, so I have anal leakage."

2. "He isn't really into fellatio, he is a "MARBLE COLLECTOR".

3.) Greg, has called my phone 100 times, he is stalking me, he needs to stop "MARBLE COLLECTING" he is desperate.
by Himachal Pradesh December 31, 2022
Get the Marble Collecting mug.
This is a old term in gay community, but is making a comeback. It means taking the virginity of a gay man, so if you like collecting marbles, then you enjoy taking the virginity of young gay boys.
Don't give it up to Billy he is a marble collector, he is only marble Collecting.
by Battyboymarblecollector December 31, 2022
Get the Marble Collecting mug.