A polyamorous couple consisting of any combination of three people. Term first coined by some chick named Melissa
Ben was dating both Josh and Sarah. They were a Throuple.
by D@de Murphy September 28, 2021
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A couple that has a mutual friend or third wheel that is always with them.

Or when a couple’s mutual friend consistently hangs out with them after 6 months or more.

This includes hanging out together on known couple holidays like Valentine’s Day.
Ever since Bob broke up with Kim, he and Ted and Michele have become a serious throuple.
by Fortune_Cookie February 16, 2020
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