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1.
SIQ
Sick in Quarters. The military's acronym for being sick enough to be ordered to stay in one's room until no longer sick.
Marine 1: Hey where's SSgt?
Marine 2: SIQ, Doc says he has bronchitis.
Marine 1: Asshole's going to be playing world of warcraft for the next three days.
by SemperFly July 26, 2011
 
2.
siq
siq is just a redesigned word for 'sick' which in slang means, ill, dope, cool, feel me? (i made up the word, in about 1995 it was my nickname in most chats and my websites nicknames.. stil is --siqwidit!-- )
thats some siq made shit..he one siq mothafucka..
by Curtis O. June 05, 2004
 
3.
siq
from the nickname x-siq - when something is beyond cool.
nigga, dat straight up siq
by x-siq April 19, 2003