When you ask for something from someone and they ask your parent/guardian if its ok and they say no.
You: Hey Tony can u get me a soda?
Tony: (to your mom) hey can they get a soda.
Mom: not right now.
You: (to tony) wtf, why did you ask, you could of just got me one and she wouldnt notice!? Dumbass pre-snitch bitch.
Guy 1: "Alright guys I gotta go, im finna go pre-game."
Guy 2: "wait, you're going to party?"
Guy 1: "no i plan on masturbating tonight but first i wanna get myself ready."
Someone who consumes wapanesemedia in moderation (but still risks becoming a full-fledged weeaboo).
1: That guy watches anime, what a weeb!
2: Hey, watch your language! Watching a few episodes of japanese-made cartoons doesn't make you "overly obsessed with Japanese culture to the point where you become annoying". He's doing it responsibly. He is a pre-weeb.
1: Whatever, he's on the path to total weeaboofication...
When you prematurely Venmo someone for a round of drinks and then you decide to buy the next round, requiring them to Venmo back to you. If you had just lasted a little longer before trying to settle up, no Venmo would have been necessary.
Friend 1: Ok, I'll Venmo you for that drink.
Friend 2: Hold up - you know we never have just one beer. You don't want to have a pre-v.