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When one laughs so hard that their mouth goes very wide open and the corners of their lips become highly rounded - so that when viewed side-on, their lips literally take the shape of a taco shell.

If you manage to get a side-on image of your friends taco laughing, it is guaranteed to become a crowning meme in the group.
Me: Why did the chicken cross the road?
Friend: I don't know, why did the chicken cross the road?
Me: TO GET TO THE OTHER SIDE!!!!!!!!
Friend: OMG HAHHAHAHAHAHA -Taco Laughs-
Me: -Takes picture, posts it on group chat-
Friend: Oh no did you take a picture of me taco laughing?
Me: Yeah I took a picture of you taco laughing!
Friend: Ugh my mouth is in the shape of a taco in this image!
Me: Yup, that's why it's called the taco laugh!!!
by Lefty Power 123 July 07, 2019
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Jun 4 Word of the Day
The phenomenon of having to come out as bisexual to the same person/people repeatedly because they assumed or hoped that your sexuality was a "phase." Refers less to the holiday and more to the 1993 Bill Murray comedy film in which the main character experiences the same day over and over.
"My visit home turned into Bisexual Groundhog Day. My mom acted shocked when I told her I'm going to Pride next week, so I had to come out to her as bisexual AGAIN."
by Tiggy Upland April 15, 2014
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