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1.
A slang expression used to humorously imply that the preceding statement was an understatement. If speaking, the word "then" is usually stressed.
"You're a real bastard, ya know that, Joe?"
"And then some." - from the film 'The Last Boy Scout' (1991)
by Bill M. July 27, 2004
 
2.
lasting for all of eternity
i want to be with you forever, and then some.
by SWD Heturtle October 17, 2010
 
3.
when something wreaks of a combination of disgusting smells.
Her breath smells like and then some... and then some shit, and then some ass, and then some fish.
by awills94 July 01, 2011
 
4.
To further express the magnitude of Times Ten
That party rocked, Times ten and then some
by Andrew November 14, 2003