What does RTDM mean?
Read The Damn ManualOther definitions of RTDM:
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How to use the term RTDM:
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More slang terms:

OTFLMAO
On the floor laughing my ass off

PMP
Peeing My Pants

SWALBCAKWS
Sealed With A Lick Because A Kiss Won't Stick

IH8TU
i hate you