Boopnot is the word used when someone is about to boop you (a quick touch of finger to the nose) but they move their finger just before they do it.
"Oh my god did you really boopnot me?"
"Haha I boopnotted you!"
Grouler is the word used to describe someone who is nice most of the time but will retaliate and become mean unexpectedly when their feelings are hurt enough.
"I didn't know you were such a grouler!"
"Be careful of Abigail, she's such a grouler."
The word 'skeeb' is used to describe a group of people who do not like each other but hang out together. This word is typically used to describe teenage girls but can be used to describe many people.
"Those girls are such a skeeb"