The feeling of euphoric happiness or sexual pleasure that occurs when a Damian Lewis fan sees him do or hears him say something very sexy. Something that is prone to give someone Damiangasm is said to be Damiangasmic.

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.

When you’re jilling off to Damian Lewis and have the best orgasm you ever had in your entire Life.