Stop being a pussy

the Phrase "stop being a pussy" is a slang term describing the actions and whining sounds that cats can create. These utterances of the feline members can be found to be annoying as is the constant actions of rubbing its body against yours.
In this context, being a pussy is to in fact to be whining and annoying.

"I don't like how everyone keeps on ignoring me!", says John; "stop being a pussy", comes the soft lull within the crowd

being socially unacceptable

Breathing, generally.

Person 1: Stop, you are being socially unacceptable.

Person 2: *Incohrent screaming*

Person 1: You spelled 'incoherent' wrong
Person 2: Incohrent crying

being dirty

looking fresh while playing a sport (usually baseball)

Crotou was being dirty while pitching today.
Nick Swisher wants to be as dirty as Crotou.

Being a little bitch

Spending the evening with the mrs instead of being with the boys, mainly with pre-existing plans then cancels.

Wow he was being a little bitch and didn’t show up for 5 a side tonight

just being alive

Dispite what the other definition said just being alive
Means living presently

just being alive means living chill

Decent human being

A term to describe a person that you thought might like you romantically (but in fact he/she’s generally a nice people.)

She being a decent human being to you doesn’t mean she will like you.

Just being Miley

Popular internet saying brought upon by one Barron Shiel and one James Duffy, inspired by the singer Miley Cyrus (or Hannah Montana) used in cases to describe someone that is getting overly excited, stressed, or simply silly; first used in the popular MMORPG World of Warcraft. See lyrics to "See you again" for reference.

IT'S A TRAP!
Dude he's just being miley!