When you call someone an insult, generally close to the truth, can often be hurtful.
If you do lib someone they have to accept it with out retalation.Common form of pranks also.
Libbings also come in the form of five people insulting each other unprevoked.
"OMFG YOU DID NOT JUST CALL HER AN ALCHI"
"yeah but it's cool it's a just lib"
"oh sweet nevermind."
"Oh man i cant believe you kissed that fat chick."
"Leave it out man"
" it's only a libbing"
"Haha cool carry on".