Having the best flush possible in poker. Often misunderstood as an ace high flush. In some games of poker, like omaha or hold'em, there will be the possibility of a straight flush and an ace high flush would be beat. When this happens, an ace high flush (unless it is the royal flush) is NOT the best hand, thus, it IS NOT the nut flush.

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

Urinating after masturbation, in order to 'flush out' the residual nut left in the shaft of the penis.

Oral sex performed on a male.