Sleeper OP 

A character in a video game that is simply too strong (overpowered, or OP for short), but not many poeple realize it (yet), hence the "sleeper" part.

This is likely due to the fact that when a new version of a game comes out, it takes a while for people (including some pros) to adjust to the new meta game and rather stick to the same staple set of popular overpowered characters (sometimes despite nerfs) out of comfort instead of trying to discover new ones.

This is NOT related to special snow flakes that somehow made a bad character work against all odds in 1 out of 100 games; Sleeper OP is legit broken, it's just known by the unenlightened masses.

When the Sleeper OP char becomes common knowledge, it loses that status.

Term originated in League of Legends.

Player A: LUL why you pick the Merchant, he's trash.
Player B: Nah man this is 0.24 Merchant, meta sheep just haven't caught on. Merchant Sleeper OP
*PLayer A gets obliterated by Merchant*
Player A: You just got lucky, Merchant sux!

Sleeper OP by Han shot in between November 1, 2018

puss op 

when you dont want the girl but you just want the pussy opportunity

dont worry she wasnt that hot it was just another puss op

puss op by steven charles1 August 13, 2008

Phelps Photo Op 

The act of forgetting that almost everyone that owns a phone also is carrying a camera or video camera. The act of doing something stupid or regrettable that is caught on camera.

Hey when you went to that party, I saw a Phelps Photo Op shot online.

Phelps Photo Op by Habbie February 20, 2009

co-op

a bastardization of working with company while a student in college for alleged "mutual benefit", or the exploitation of college students as low paid somewhat educated technical bitch labor, or a person who wastes time at work by emailing other co-ops all day

I can't believe that my years of learning have gotten me this Office Space-esque monkey job as a (CAD, Excel, MS Office, etc.) bitch.

Also:
We sent an average of 347.53 emails per day on teh co-op email list.

co-op by gtekwins August 4, 2003

no-op 

(pronounced 'no op', from NOP the computer assembly language instruction that tells the computer to do nothing)

Loser; a stupid or lazy person.

He's a complete no-op. Ignore him.

no-op by node-edon April 22, 2006

Goo-OP 

To represent all is well, always; Always good & never stops; never disperse or changes Always thinking positive; to weed out the negitives in life;

If someone ask, "How are you doing" The (response) would be "I'm Goo-Op". Asking someone what's up & how they're doing, "Whats Goo-Op" or "What's Goo-Op with you".

Goo-OP by STIX High Quality Ent. July 29, 2011

in before op 

Created in the GameTrailer forums. Due to a huge glitch known as "Database Error", whenever someone would make a thread, he/she would make 5 threads in its place with no OP.

When people came in, they would reply "In b4 OP"

*enter thread with no OP*

"inb4OP" or "in before op"

in before op by dark slayer April 2, 2009