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A person of the opposite sex one takes to ones parents for Thanksgiving, to allay any suspicion of one being gay.
"Well they look happy together...I'm pleased for him"
"Are you kidding? Our son is as gay as a fruit-cake and she is obviously his Thanksgiving beard!"
by drbollocks November 30, 2009
An unintentional beard started over the 4 day Thanksgiving weekend, where you're too lazy to shave it off monday morning. Usually continues until Christmas or New Year's Day.

Also known as a Holiday Beard
Boss: You look like you haven't shaved in days. That's unprofessional.
Employee: Sir, that's my Thanksgiving beard. It's my way of honoring our forefathers.
Boss: Oh, I didn't realize that. Maybe I'll grow one too.
by slartoox November 23, 2009