What does C4 mean?
Plastic explosive
Other definitions of C4:
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How to use the term C4:
There are no example uses of C4 at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

OOM
Out Of Mana

QMWIH
Quick my wife is home

SYRS
see ya real soon

EAK
Eating at keyboard