To hit someone, usually used in a threat of punishment or retribution. A knot is generally snatched in one's ass, though variants include the neck and the head.

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed

a phase used to describe dominant male canine mounting behavior, as opposed to mating with a female . The "knot" refers to the dog's erect penis, which is "snatched" painfully from the other dog's rectum when the mounted dog submits. This phrase is used as both an insult and a threat to violently put someone in their place.