What does FAD mean?
F*** a duck
Other definitions of FAD:
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How to use the term FAD:
Aw, go FAD
More slang terms:

Butt
A slang term for buttocks, which is rump or bottom of an animal. From the nautical buttocks, the lower portion of the rear of a ship.

ACGAF
Absolutely couldn't give a f**k

XS
excess

MHO
My Humble Opinion