Tribangular
Something relating to having threesome sex, or as good as threesome sex.
"Hey man, how was the party last night?"
"You shoulda been there! It was tribangular." (Meaning he had a threesome there, or it was as good as a threesome)
"You shoulda been there! It was tribangular." (Meaning he had a threesome there, or it was as good as a threesome)