Stealerer 

To be a cute stealer

Inka was a Stealerer

Stealerer by Dreamyyyy December 27, 2011

Friend Stealer 

A total bitch who comes along hogging your best friend and is really annoying. Your friend likes them but you despise of them. They act like they are all innocent but you know that they are evil deep down.

"Wtf why are they together"
"She's a friend stealer"

Friend Stealer by Honkyfoo May 5, 2016

Dirty Stealther

Camping in an urban area were you should probably not be camping.

My wife and I did a Dirty Stealther last weekend.

Dirty Stealther by Pugnacious Giz August 13, 2020

waifu stealer 

When a fictional character enters an officially recognized relationship with your waifu, thus making her unavailable, he (or she) becomes a waifu stealer. Usually, the character is described by fans as a horrible, mean person or even a womanizer, even if the character hasn't shown any signs of being that way.

The term first came to real prominence in the brony community after the first My Little Pony movie was released. In it, Flash Sentry, an incidental character horns in on Twilight Sparkle, a main character, thus pissing off any of the bronies who called her waifu.

Sometimes also referred to as "waifu thief".

Sakura was so perfect until that waifu stealer got to her

waifu stealer by CanisMinor December 1, 2014

stealerhead 

A derogatory name for someone who has just stolen your boyfriend. Screamed at the top of one's lungs towards the boyfriend stealer. Occasionally accompanied by over the top gesturing with one's hand and hysterical jumping up and down on the spot.

E: "How dare you take my boyfriend, you stealerhead!"

stealerhead by mrs ellie kelly January 26, 2009

Meme Stealer

One who steals memes, a crime against the human race, punishable by death. These people have no life or original humor and thrive off of stealing or reusing others' memes. They are generally retarded and single because they were born as internet criminals

"The city will be having a public execution of the 12 meme stealers that were caught this weekend."

Meme Stealer by The anti-scrub September 11, 2016

man stealer

Someone who goes and date your boyfriend while you are still dating him.

Emily is a man stealer because she took Johnny as her boyfriend.

man stealer by duhma June 3, 2008