Generic descriptive term for any small, weak, low quality, etc. item or person. Often used with generality in relation to drugs. This word is used as an adjective in compound nouns and as a noun.
When a person expresses a very ugly face "jib". "jib" is refferd to when people are doing drugs and they pull sick "jibs" because they are high. And now people are asked for fun to pull a "jib".
To grindlike in skateboarding on a snowboard usually on a rail or log. Jib is a category of grinds. There are others like crooked nose press, and boardslides and other shit.
Alex!, did you see me totaly jib that whole S-rail!!! It was so tight.