A gamer who uses competitive gaming (tournaments, leagues, etc.) as their sole source of income. This does not refer to someone who games all the time and attains some level of skill; being a pro gamer means you use it as your profession, and that you actually do earn money. In the USA, there are few pro gamers, and those that do exist usually make all of their money from prizes in tournaments and leagues, with some income coming from sponsorships. In Korea, however, there are actually leagues with paid salaries, closer in format to baseball.

a spanish word meaning the flipflop
used by latin moms to beat their child's ass

A person who plays video games in professional matches such as in MLG tournaments. Pro gamers play hours everyday to practice and strategize. Pro gamers are very good in a particular game type but play professionally in their best game. In large pro tournaments cash is awarded and sponsors hook up with the pro gamer.

a professional gamer, someone who makes gaming into a career that is profitable and are typically signed into a contract with an MLG team.

One who is good at nothing else in life and has to resort to playing online games to make friends and get "respect".

Being “pro gamer” means to be neutral in a conversation about a controversial topic

"Progamer" can be used to make fun of other video game players in an online community or in the middle of an online match, usually when they make rookie mistakes.

This term is presently gaining popularity, as many gamers are tired of hearing "noob" all the time.