a combination of the words "they" and "Aint". - commonly heard in the south.

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

small piece of skin between your balls and your ass hole,:Is not you balls or your ass hole so it your th-ain't

'There ain't' or 'There is/are not'. Could also mean 'That ain't or 'That is not'. Could also mean 'This ain't' or 'This is not'

I was sitting at work and was talking to a friend of mine about something and for some stupid reason I have been mixing up words with each other all week and this was how the word 'Thain't' was born. It took me a minute to realize I said it but it knew it was a winner and I had to add this to the Urban Dictionary!