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A person who sits on a couch like it's their last meal, drinks cheap beer like it's liquid gold, and has no idea what ambition is. They don't even have the energy to move to a better couch.
My cousin is a jackpine. He's been on the same couch for 10 years and still hasn't moved.
Jackpine is the reason my brother hasn't left the house since 2018.
I saw a jackpine at the store. He bought a 24-pack and still sat on the floor.