Contrary to American definitions refering to female booty...in Australia "Donk" refers to a males cock. Makes for humorous listening to Soulja Boi's song "She Got A Donk".

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 Male persons lower region (in other words the cock)

Slang for a large penis -

A human mans erect penis

The sound supposedly made when inserting something into ones ass.

A person with a penis equal to the size a donkey's penis