A confusing conjunction of "defrost" and "thaw". Has a corresponding etymology to unthaw. Literally it means to refreeze, however, it has never actually been used correctly in conversation. Ever. In fact, it is always used to mean the opposite- a synonym for thaw. Just say thaw, not dethaw, not unthaw, just thaw.
by Chuckahaid March 23, 2005
The act of thawing-out a frozen object. It is a terrible misuse of correct grammar; however, I am defining it so I can say I was not wrong in using it earlier.
by Pootiliantes March 30, 2006