look up any word, like blumpkin:
 
1.
A phrase used to dodge the blame and embarrassment associated with getting an answer wrong.
Jack: "I know that girl her name is Cindy"

Joe: "She's my neighbor, her name is Angela"

Jack: "You're probably right"
by Therightwordsareeverything January 27, 2011
 
2.
A way of disagreeing with someone without saying "you're wrong" outright; can be clever, polite, subtle, or patronizing, depending on the emphasis given to the word 'probably.'
ADAM: The earth revolves around the sun.

DAN: No way, dude, the sun totally revolves around the earth.

ADAM: You're probably right.
by Puritan Bag February 05, 2011