What does POSC mean?
Piece Of Shit Computer
Other definitions of POSC:
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How to use the term POSC:
There are no example uses of POSC at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

LY4E
Love You Forever

UAC
User Account Control

SBI
Sorry aBout It

FLOG
Sell