Verb. To jib. Jibbing. The act of manuvering a bicycle, skateboard, snowboard or skis in tricky manner on top of and around a structure such as a stump, rocks, stairs, railigs, rooftops, etc. When you are playing around, showing off, jumping, flipping, hopping, etc you are jibbing.
jib....to avoid or get out of doing something.
To jib something is to duck out of doing it.
To be a jibber is to let somebody (maybe a friend) down.
To let down all your friends at the last moment is to be a jibbin git.
To actively tickle the meat between someones ribs. Jibbing is very similar to the funnybone but instead of hurting it often leads to a recipient wetting themselves.
Come up behind someone and jab your fingers in between their ribs and move about quickly. At this time you are actively jibbing. They will try to run or drop to the ground but don't you let them.