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

TMNTM
That Means Nothing To Me

AS
another subject

HXC
Hardcore

HBASTD
Hitting Bottom And Starting To Dig