What does GD&H mean?
Grinning, Ducking and Hiding
Other definitions of GD&H:
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How to use the term GD&H:
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More slang terms:

JLS
Jack the Lad Swing (band)

PYW
Problem Younger Woman

MY MAINS
In the case of Super Smash brothers (a video game where famous Nintendo charaters duke it out). Your mains are your charaters your used to playing as, Thou most people only have one main charater per Smash game.

HVNT
haven't