When a tree overhanging a road is hit by an 18 wheeler or other large vehicle. Named for the 'square corner' it leaves in the tree. Can also be used as a verb for someone who wants to have roadside objects removed.

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.