To be caught red-handed, in the very act of committing a crime or error. It implies that there is no possible way for a person to explain away their mistake or crime.
We've got the Congressman dead to rights on accepting bribes, there's no excuse he can make.
by julatten October 07, 2004
with no possibility of escape or evasion
They caught him dead to rights when he broke in at night.
by The Return of Light Joker October 14, 2009
Calling someone out for something
"John got Aaron dead to rights on Rhonda being chunky"
by Josephine H September 24, 2003