one of 

A part of a group or a subunit of a larger unit

One of the things that kill poor people is poverty

one of by Pffm8 January 26, 2019

One of the Guys 

The female version of the friendzone. This phrase is used to indicate a female who is viewed as a platonic, non-sexual entity to a male or group of male friends. The moment a female is referred to as "one of the guys", she becomes aware that if she has any romantic feelings towards any of the males in the group (or, specifically, the male who referred to her in that way)--it is a moot point. Her male friends will come to her to talk about their bad relationships or advice on what gifts to get their girlfriends. If she does get a boyfriend outside of the group, they may find it very difficult to accept her any longer--as there is now competition for her time--and it may bring about the abrupt realization that she is, in fact, a "girl".

Anna: Oh, hey guys. You all got dates for the party?
Alfred: Yep.
Arthur: Nope.
Anna: Oh, well, we could go together, Arthur.
Arthur: Haha, no! You're like 'one of the guys', Anna. It would be like going with Alfred.
Alfred: You wish.
Anna:.....ah. I see.

Elizabetha: Hey, Anna--did you ask Arthur about the party?
Anna: Yeah. He told me I was "one of the guys".
Elizabetha:....oh. Sorry, Anna.

Anna: I don't get it--am I ugly?
Elizabetha: No, no--they just look at you like a sister. Completely platonic.
Anna: I thought guys didn't do that.
Elizabetha: Well, the media says they don't---but they're actually just as human as us.

One of the Guys by sailtheplains September 21, 2013

One of the bois 

A girl who’s in a group of bois. The Bois have a mutual agreement to not have sexual relations with that girl

Kristine is looking sexy as fuck tonight

Ant she's One of the bois

Oh fuck sake

One of the bois by ChrisJoseph April 28, 2019

One Of Us 

When one person in a group isn't down with whatever the rest is doing, all the others chant this phrase until that one person wants to join in.

Ethan: Hey guys, I heard the new mall is opening today! Do you want to cut class with me to go check it?
Cody: Yeah, bro. How about you, Mark?
Mark: I'm already excited to go with you guys! Trey, you're coming, too, right?
Trey: No, I'm afraid I can't come with you guys. It's too risky, and I might get in trouble.
Ethan, Cody, and Mark chant "One of us! One of us! One of us! One of us!"
Trey: Alright, fine. I'll go with you guys.

One Of Us by realest tho. June 24, 2016

one of a kind

This phrase probably means something unique, has no similar thing from its sex.

She's not easy to find, she's one of a kind

one of a kind by Nabeel, January 15, 2008

One of a kind

A common phrase used to tell someone they're unique or that an object is.

Idiom
Adjective

"Wow, that's a special ring! Your 'fiancèe' is a special lady,"

"Yeah, it's custom-made. I wanted to make it one of a kind, just like her."

One of a kind by The Eord June 1, 2016

one of those days 

A day where you just want to break something, preferably something that will scream and/or bleed as you do it. You may or may not know of any direct causes, but most often, something bad happened early in the day which started you off in a generally bad distemperment that only got worse as multiple unfortunate events compounded to effectively gang-rape and murder your overall disposition.

Your bet bet is to stay away motherfucker, it's just one of those days.

one of those days by The Red Kaiser September 3, 2005