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1.
1. An incredibly terrible clan called the International Society of Maniacal Killerz that once existed and flopped within days after achieving about three members.

2. Any clan that seems to have no purpose or is very bad at any game.
That clan is so ismk, they've lost every match!
by Ray April 10, 2004
 
2.
a stupid guy most likely from the united kingdom who makes generalizations about people based on nationality.
THOSE DUMB MERICAN HAMBURGA MUNCHA"S EATIN UP THE GREASE AND SHEWTIN AT MEH
^posted by ismk
by thegarbear14 May 05, 2011
 
3.
1. see ismk.net

2. Used to be a clan, now a symbol of how the internet is ruined.
You =ISMK= clan think yo so hot, but really you're not!
by Tim April 19, 2004
 
4.
It's ok. From mk being 'ok' on the tv show South Park.
Person 1. Thanks 4 that.
Person 2. Ismk
by Bridgg May 01, 2007