Somebody that lies about every aspect of their life, what they believe in, what they feel, and who they are. Somebody that has an endless amount of false names, not false screen names or something mostly benign, something a bit more malicious, but has many false names in real life and claims each one of them is his/her real name.
The girl was the kind of poser that didn't want anyone to accurately identify her, so she had numerous false names and looked like a different person on the outside almost every time you saw her.
by Solid Mantis May 12, 2021

Someone who starts posing as an oddball or a weirdo once the stigma is gone and there's no social consequence. The kind of people who wouldn't smoke pot or do any drugs that would make them look like junkies until there was no stigma and everybody did it.
The oddball poser found a sense of comradery with a group of other oddball posers once there were no more odd people left, and phasing them out was complete.
by Solid Mantis May 1, 2020

a poser is a fake surfer girl, jersey girl, and chill girl, she is 19 and still doesn’t know what weed looked like. she is a fake fan of all classic rock and calls herself a dead head when she can’t name 5 songs, at least 3 and she’s getting posters to put in her 2008 aqua 10 year old room. and last of all. she’s still a virgin
by peniscondomsdepression July 21, 2019
