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1.
To get the fuck out of the way; duck in anticipation of a projectile being launched at one.
Believed to be popularized by sea pirates, who generally told others to "hit the deck" when under attack from other ships.
by Kanda February 01, 2008
 
2.
To go to bed, to sleep.
I'm tired, I guess its time to hit the deck.
by keroja December 04, 2010
 
3.
To get high or stoned, by smoking marijuana.
'Hey Man, are we going to hit the deck tonight?'

'I Hit the Deck hard last night!'
by Mary Jay Wana March 07, 2009