O face

O face

n
the facial contortions typically displayed by a person during sexual climax
[C21: short for orgasm face]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014