1) A versatile slang term generally meant to insult an individual for perceived lack of competence, style, panache, or the ability to perform the given task at hand. Likewise, the referenced individual's actions may detrimentally affect the overall spirit of a group (whether temporarily or permanently). It can be used as a noun, verb, or adjective.
2) A derogatory term for someone who utilizes a wheelchair or walks with an abnormal gait.
3) A BDSM enthusiast who fancies full-bodied latex and or leather "gimp suits" (ala "American Horror Story", Season 1).
(n.) That girl is hot. Why is she dating that gimp who works at Planet Fitness
(v.) It's a miracle that those girls at the bar even talked to us after you were gimping hard the entire night.
(adj.) Aaron: Bro, you left everything on the grill too long. Those are some gimp burgers!
Kyle: Gimp ass move, brah
2) Look at that poor gimp hobbling out of the ER.
3) Ben, why did you dress up like a gimp last night?