That person who sits at different lunchtables everyday,just to switch up their routine,regardless if the people at different tables like them or not. This corresponds with sluts being all up on other guys.
A table slut is to different lunchtables,as a slut is to different guys. Hence the term, table slut.
Alexis: I fucking hate that kid.
Lunch Table: Why?..
Alexis: He's such a table slut, he's not welcome here.