Te pasas de lanza
Slang primarily heard amongst Mexicans, but not exclusively. Basically means going over-board, as in, too excitingly, too eager, TOO extravagant, to the point where you simply make a fool of yourself.
(Monday morning before 1st period)
Jr. High School Kid: Oooooooooh, I can't wait!!!!
Friend: What's up chuck? What are you excited about?
Jr. High School Kid: I bought my girlfriend her Valentine's gift!
Friend: Sweet, what'd you get her?
Jr. High School Kid: I bought her Chocolates, scented candles, flowers, stuffed animals, I wrote her a poem, I took new pictures of myself and put it in a heart frame, I bought her a puppy, some perfume, new earrings, a $250 gift card to Victoria Secret, a diamond ring for when we get married, a ne ....
(interrupted)
Friend: Woah Woah, you bought her a ring? Dude, you've been going out with her for a little over a week haven't you?
Jr High School Kid: I know, I know, but she's the one!
Friend: rofl! Te pasas de lanza.
Jr. High School Kid: Oooooooooh, I can't wait!!!!
Friend: What's up chuck? What are you excited about?
Jr. High School Kid: I bought my girlfriend her Valentine's gift!
Friend: Sweet, what'd you get her?
Jr. High School Kid: I bought her Chocolates, scented candles, flowers, stuffed animals, I wrote her a poem, I took new pictures of myself and put it in a heart frame, I bought her a puppy, some perfume, new earrings, a $250 gift card to Victoria Secret, a diamond ring for when we get married, a ne ....
(interrupted)
Friend: Woah Woah, you bought her a ring? Dude, you've been going out with her for a little over a week haven't you?
Jr High School Kid: I know, I know, but she's the one!
Friend: rofl! Te pasas de lanza.