This refers to young females who generally have normal sized heads, upper bodies, but extended torsos. This results in a lower hip and buttock region, and shorter legs. This phenomenon is actually quite funny to look at.
Tyrone: "Sup dawg, check out dattrick with da low rider!"
Big Mike: "I'd hit dat still"
When you fart and the fart travels towards the front of your body moving across your tant and up towards your balls or pussy, giving you a tickling sensation. Usually occurs when there is excessive sweat in the area.