The significant other of a person
who is gay... BUT they are of the opposite sex. A beard is used to make the world think the gay partner is straight. Sometimes
the beard knows they're a beard, and sometimes they're being
deceived.
"I didn't want her to think that I was Gay and I was
hiding it from her, and that I was using her as like a "beard".
'Cause that's what the whole internet probably thinks!" -
Shane Dawson, Coming Out Video.