Fucking stupid truck from Ubisoft's racing game, The Crew.
I drove my cumster truck into an orphanage, fuckers stood no chance.
A Cumster is a hamster, but someone ejaculated on him, an therefore he became a Cumster.
Dude i just made a cumster out of your hamster, im sorry.
Jerry: Hey John, why do you cum a lot?
John: I am a cumster
A Cumster is a mix between the word cum and hamster, its basically a hamster someone came on and that is dripping in cum.
Dude i just came on your hamster, i made him a cumster
Used in accordance of a close friend being an asshole, to the degree that you'd call them a cum dumpster.
Dude shut the fuck up, your such a cumster.