Lol Slut
Someone who use terms such as "Lol" or "xD" in frequent scenarios, however don't in fact laugh themselves and just abuse these terms.
Person 1: This guy keeps saying Lol all the time and it's not even funny.
Person 2: Looks like you're dealing with a Lol slut.
Person 2: Looks like you're dealing with a Lol slut.