Shaint Happenin 

A slang term combining the words Shit Ain't and Happening.

"Hey can you spot me another twenty bucks?"
"Shaint Happenin"

Shaint Happenin by Mikerey October 22, 2011

saint happening 

Same as ain't happening or not happening. Reference of a highly comical Capital One Commercial featuring David Spade.

Customer: Can my miles card get me to Mexico?
Agent: no way jose.
Customer: Saint Thomas?
Agent: Saint happening.

saint happening by jim17g April 5, 2005