Example 1
Girl 1- Whoa, you got a tattoo without asking your parents?
Girl 2- Yeah my parent's are going to kill me and my older brother who signed off as my guardian.
Girl 1- Looks like you guys have gotten yourself into a pretty bad buttweave...
Example 2
Boy 1- Andrew is such a buttweaver; everything he says makes people uncomfortable.
Boy 2- Dude yeah he really needs to learn how to act like a normal person.
When something is underwhelming or disappointing. Most often used in a context that involves a person describing the poor state of something, such as a meal or TV show.
"Dude, this caf food is straight buttslap." "I'm bummed bro, that movie was buttslap."