to show up unexpectedly at the most inopportune of times.
As I was receiving the lap dance of my life by this bargain basement whore at my bachelor party, my fiancee popped up like a pimple on prom night and caused Willy The One-Eyed Wonder Worm to run for cover!
by weave November 02, 2003
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n., Someone who comes in and out of your life. There one minute gone the next.
You can never count on this person to be there when you need them. They show up when it's convenient for them, usually with a hidden agenda.

I.E. On the 1st and 15th, I can expect a visit from my favorite jack-in-the-box-pop-up-artist
by TGDub September 01, 2009
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Pop-up Willy

a toaster, something that you stick a piece of breat in to make toast or possibly grill cheese sandwich
Man stick your fork into pop up Willy n get my eggo
by the_toast_master April 05, 2005
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pop up tag

A Pop up tag is a hashtag game on twitter that isn't scheduled. Somebody thinks of a hashtag they think is fun and post it on twitter, people that like the hashtag play along.
I'm not playing that hashtagroundup tag I don't like it. I'm going to play this pop up tag instead
by Billy from Philly July 13, 2018
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wall-stalk pop-up

Someone who posts something random on your Facebook wall, or comments on a post for the sole purpose of being seen by someone else/making their presence known. Usually done by an ex-gf/bf, a wanna-be gf/bf or in sneaky cases, by someone who wants you to friend them but does not want to send a friend request for fear of being rejected, so posts it on mutual friend's page.
Usually this pop-up is ignored, like most screen pop-ups because it's an obvious "look at me" attempt.
Jenny: "Did you see that random post on Tom's wall from his ex?"

Alexis: "Yeah, I'm not worried. It's just a wall-stalk pop-up. He doesn't even talk to her anymore."
by jb3625 January 20, 2011
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pop-up asshole

A person who, in a public place, suddenly shows up and is an asshole
I was waiting on the platform when all of sudden, this old fuck who I don't even know glared at me and called me a "piece of shit." May an agonizingly slow death befall that pop-up asshole.
by Rudee July 25, 2018
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Pop It Up

To get excited or hype, typically in a party atmosphere or with/ around others.
Rob: Dude this party is sick, I love this song

Tyrone: I know right! Watch me pop it up on god
by Justj123 December 27, 2020
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