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1. HMD
Hold My Dick. Used when the environment is not ideal for this type of language.
Guy1: wah wah wah nag nag nag

guy 2: BRO! HMD!
2. HMD
Hold My Dick. Best used when you did something so amazing like running for 67 yards and breaking 8 tackles to score a touchdown.
Guy 1:OH DUDE DID YOU SEE THAT RUN MADE BY MARSHAWN LYNCH?

Guy 2: YEA DUDE WHEN HE SCORED HE WAS ALL LIKE HMD!
3. Hmd
Hold My Dick
"He goes for the Hail Mary.....he throws.....the catch! OH SHIT TOUCHDOWN!! HMD!!!!!!!"
4. HMD
acronym for Hold My Dick. Used to express great achievement(s).
Beating someone in Guitar Hero by one point. HMD

Comparing Girlfriend's bra sizes.

Dirk Nowitzki v LBJ. Dirk to LBJ-"HMD"
5. HMD
Short for "Happy Mother's Day".
Do you have kids?
Yes, I do.
Well HMD!
6. HMD
"How's My Driving"

Opened post for criticism about how a character is played in a roleplay community.
I've heard some people think my Naruto's not IC so I've opened a HMD post.
7. HMD
Hold Me Down
yo HMD me with 5 dollars
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