The project management of online dating...remembering what you said to whom and when on which social network or dating site...and maintaining a fully auditable digital record of said exchanges for legal purposes.
When game information outside of what is available in a game is used to give a player an advantage in-game. Most commonly seen and frowned upon in many forms of role playing especially when consent has not been given.
Example a.
A dungeons and dragons adventure team comes across an unknown monster in-game. The metagamer knows this monster through out-of-game information. Using this information, the metagamer's character acts upon the monster's weaknesses and attributes despite the character having never seen the monster before.
Example b.
In an online pan-fandom RPG, Ryoga from Ranma 1/2 meets Ken from Street Fighter for the first time and they have a fight to the death. Ken finds some water in a random nearby bucket and dumps it on Ryoga, then proceeds to pummel the life out of Ryoga who is now transformed into a tiny black pig because of his water curse.
When someone named Megan does something particularly well. This phrase can also be applied to individuals with other names. Can be used when an individual is talking to an attractive person, doing well on school work, or just being fucking awesome in their daily life.
After spending six hours studying, Johnny completely meganated all over that math test.
Megan is talking to that cute guy and getting her meganate on.
Hey yo, you're on a roll, just wanted to point out that you are meganating so hard today.
John was accused of metagaming when he immediately moved his player to the most protected area of the map to snipe the enemy team members, since he had played the map before and knew from experience.