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3. Hit the Deck
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!'
1. Hit The Deck
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.
2. Hit the deck
To go to bed, to sleep.
I'm tired, I guess its time to hit the deck.