Lily Aldrin (Alyson Hannigan) is a kindergarten teacher and an aspiring artist. Lily was originall engaged to Marshall before they broke it off for her to try and be an artist in California. However, she returned to him after her fellowship ended and the two quickly married by the end of season two.
Barney: Guys, I just tasted an amazing caterer.
Lily: We already have a caterer.
Barney: Oh right! You're getting married. [to Ted] You see what I did there?
Lily: Don't Ted-out about it.
Ted: Did you just use my name as a verb?
Barney: Oh, yeah, we do that when you're not around. "Ted-out": to over think. See also "Ted-up". "Ted-up": to over think with disastrous consequences. For example, "Billy Tedded-up when he-"
Ted: All right, I get it