What does SIU mean?

suck it up

SIU

Other definitions of SIU:

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How to use the term SIU:

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More slang terms:

OUCH

OUCH

Interjection said when experiencing pain

Simp

Simp

Refers to a person who is attempting to win favor with someone who is less than interested.

IMNSCO

IMNSCO

In My Not So Considered Opinion

AMW

AMW

Americas most wanted