2
A term coined among the black community to tell some one to calm the fuck down. It's usually used when some one is "actin a fool", "trippin", or they "don lost they mind". Generally used among the older generation, It's a term the younger generation can not help but use as they mature into adulthood.
Tyra Banks is starting ANOTHER cycle of ANTM and doing her talk show. She says she wants to be the next Oprah.

Tyra needa sit down.
by Anesha February 12, 2008
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3
A meeting between two or more humans.
Tell Tony we need to have a sitdown with Vito.
by chad sapieha December 21, 2003
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4
to have a meeting with members of the la cosa nostra including your sponcer( if your not "made" the member who vouched for you if are a "made"man then it would be with your boss"capo")to resolve an issue amongest other family members or other families.
tony has a problem with vinny. both are made men and tony wants to kill vinny. inorder for tony to do so he must first have a sit down and get an okay even if tony is right in matter he still needs the go a head or else he'll be the one geting wacked.
by x February 24, 2004
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5
Shut the fuck up. Most appropriately used in chat rooms when some faggot comes along bringing along drama or the faggot is trolling the room for some unknown reason.

It also has a meaning to admit defeat. Most appropriately used when someone gets owned in a chat room and they still keep trying to start shit with others.
1 - Sit down faggot.
2 - You have been owned faggot, sit down!
by Some faggot on TEH INTERNET!11@ December 20, 2004
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