Someone who works at a direct care facility and helps to take care of people with developmental disabilities--especially ones with genetic cognitive disabilities. Essentially a baby sitter for retarded people.
Friend: Hey, let's go watch the game tonight!
'Tard Sitter: Sorry, bro. I can't go out to the game tonight because I picked up an extra 'tard sitting shift tonight.
by redpillsatori July 15, 2021
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a term used to describe someone you hate.

(mean to get sexual pleasure from sitting on plants.)
dude i hate so much that kid he's a plant-sitter
by buttmaster808 August 6, 2010
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Someone that looks tall while sitting,until they stand up
Jaimes"How was that midget driving?"carl"he's a tall sitter."
by JCM2009 November 2, 2009
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