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Acting in a suspicious manner; usually devising a plan against another.
What have you been up to recently?

Just shirming...

Dude, that's not cool.
by AK47DON August 24, 2010
that ill PCP shit knokin u on ya ass
dam homie I think that books attackin my leg this shirm is crazy
by police hater May 15, 2008
a pussy,a coward,a lame
You shirm ass nigga
by Shaad October 12, 2006