The act of saying popular Memes. Generally used when angry at someone for repeating popular, more annoying, memes.
Hey Vasquez! Quit Meming!
The time period during which an event is at the peak of it's popularity. These events are almost exclusively created on and/or grown on the internet.
That Harlem Shake meme was only meming for like 2 weeks. Gangnam Style memed wayyyyy longer then that.