A after sexual intercourse activity - where you nut in a rag - commonly called a "nutrag" but in this situation your using a more custodial or shop rag type towel, after cumming in this towel you then slap it in your partner's face and tell them they've been hit by the "Janitor"
You have been at the club all evening and pick up a pretty descent bimbo for later in the evening festivities. Right after you've "gotten yours" because no one cares about hers, you quickly slap the cum filled "janitor" towel on her face. By accomplishing this you secure a quick and speedy "getaway" while she's in bathroom thinking what an asshole without the, "can I have your number?", "will I see you again soon?" questions.
by Spidy December 9, 2007
Get the Janitormug. A Janitor is the kinda guy who pulls girls so hard, that he practically cleans up all the available girls, leaving none for anyone else.
by dspirsoni June 4, 2014
Get the Janitormug. a creepy person at your school that cleans up after you. In reality, he is pedophile. After school, he fellates children in the bathroom, hardcore. He also makes out with other janitors and masturbates with children.
Kid 1: We gotta get out of here before the doors of the school close.
Kid 2: Yeah! The janitor's a real pedo!
Kid 2: Yeah! The janitor's a real pedo!
by neversaymyname June 7, 2011
Get the Janitormug. 
A nickname given by (mostly oneself) others to a person who is professional in a particular game or sport.
Niko:So, Roman, why are these loan sharks after a fat slob of shit?
Roman:Cousin, they don't call me a fat slob of shit, they call me the Janitor and that is why they are after me, cousin.
Niko:And why is that?
Roman:Because I clean up(Awkward Laughter), get it? Janitor? Clean up the game? No?
Roman:Cousin, they don't call me a fat slob of shit, they call me the Janitor and that is why they are after me, cousin.
Niko:And why is that?
Roman:Because I clean up(Awkward Laughter), get it? Janitor? Clean up the game? No?
by deathcop4000 June 13, 2018
Get the Janitormug. When someone (in a first person shooter game) appears at the last second and steals my kill because he somehow put the last bullet into the noob I've been shooting at.
In Halo 2 - when anyone steals your kill right before you were about to put the final bullet in someone's head or heart. Hence the name: Janitor = Anyone who comes in and cleans up the "crap" they never started.
by RAIN January 27, 2005
Get the Janitormug. by Brittvj January 4, 2009
Get the janitormug.