Third Base with oral action. Giving a blowjob to a guy or eating out a girl. The last base before home plate.
by A. Nonymous November 15, 2003
Yea, I cant believe she handled all of those sloppy thirds. Each third was so sloppy, but together they are sloppy thirds. When one left to use the restroom, it was temporarily sloppy two/thirds.
by the definer. July 05, 2010