A blacksnapper is a person who mostly replies with a black photo with text on Snapchat. You send a beautiful selfie to them, and all you get back is a lousy blacksnap. A blacksnapper is a person who don't understand that snapchat is an app for sending photos, and that he/she rather could have sent a regular message instead of covering up the lens and blacksnapping.
Person 1: It's so boring to snap with John.
Person 2: Yeah, he always sends a black screen with text, never a selfie or anything.
Person 1: Yeah, he is a real blacksnapper
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.