(1) Unexciting, unadventurous, mainstream or dull. Generally used in describing a person with such attributes or who plays it safe. Historically, derived from a person whose goal in life is to have three "squares" a day (see definition (3) below), a roof over his head, a respectable job, a house, 2.5 kids, etc. Became a hip/popular expression of derision of the mainstream in the beat generation.

(2) Proper, decent, straightforward, acceptable, even.

(3) A regular and decent meal.
(1) Naw, he's a square; he won't dance (do anything exciting), he'll just shoot crows (go home).

(2) Hey man, thanks for takin' care of that, you're all square with me now.

(3) Dack is joining the army; at least he gets a dry bunk and three squares a day.
by Lazz March 4, 2008
aaron: "hey steve, can i bum a square off of you?"
justin: "a wHaT!!??"
aaron: "a cigarette, you square."
justin: "did you just call me a cigarette?! aw HELL no..."
by tazmanian guamanian December 25, 2010
1. (n; adj) A person who is regarded as dull, rigidly conventional, and out of touch with current trends.

2. (prop n) Video game production company who created the Final Fantasy and Chrono series of video games for the last two decades.
by QZkotL April 9, 2003
Opposite of groovy. Unlike a round, long-playing vinyl record which has one playable groove on each side, a square record would not track a tone arm and cannot be played. There is no music and no soul in a square record. Something or something square just isn't with it, and lacks fun and liveliness.
Man, you don't dig this music? You are like really square.
by urbanzson July 24, 2009
A noticeably unhip, mainstream individual, a straight. Someone either ignorant or disinterested of underground subcultures. The antithesis of a hipster.
I like Lee, but she's a total square.
by Danny Delinquent March 22, 2004
Yo, here dat nickel I owe yaz, we square now.
by Phlagellum October 8, 2003