Describing a state where a person's brain can't process information quickly. This is not to say that they are outright stupid, just slower than average. Origin comes from field of computing where threads represent units of processing in a system capable of concurrent processing.
How single-threaded was Brian in that meeting today? He was not keeping up at all.
Totally. Anthony was much better - across everything that was going on. He's one multi-threaded mo-fo.
Describes the action of sexual intercourse of all forms. Term derived from the fact that you thread the eye of a needle with cotton as you thread an orifice with your rod.
'Man, last night i was out all night and must have threaded like 10 chicks'
'That chick was gagging to be threaded'