to confidently attempt to perform an impossible task, having misunderstood the difficulty of the task or overestimated one’s ability to complete it. Often with loved one(s) looking on and questioning one’s sanity in the vain attempt.
He thought he could make the company more customer centric, but he was lifting the back deck.
"On Deck" also means that you are a drug dealer.
Reference:
The Online Slang Dictionary
(American, English, and Urban slang)
When you got multiple hoes lined up, they on deck. It originally is a baseball term meaning next up to bat.
Person 1: Ayy these girls blowin up my phone I got multiple hoes on deck.
Person 2: I see you boy
When a Warlock topdecks a good card using his hero power in Hearthstone.
"...That son of a bich tap-decked Siphon Soul and prevented my lethal! never lucky bullshit"
"!or: "Hahaha Doomguard tap deck easy win
When a warlock topdecks a card using his hero power (Life Tap) in Hearthstone, it is called Tap Deck
"The Warlock got lethal with his amazing Doomguard tap deck"