An annoying person online, often in teens, who becomes tough when they get behind a keyboard. They often talk trash, curse, and criticize everyone. But, if they were to see that person in real life, they would probably shit themself. Also, many laptop gangsters live in the suburbs.
Laptop Gangster-"Bring it bitch, i ain't scared of no one. I grew up in the hood pussy."
John-"Shut the fuck up you little 5 year old. You're nothing but a laptop gangster."