1. To be in a state of extreme confusion, disorder, or panic often causing a sudden wave of trepidation.
Person 1: "Oh no, we're not gonna be sitting next to each other on the flights!"
Person 2: "No, we will, the seats are next to each other."
Person 1: "Oh, phew, I was trooping."
Person 2: "No, we will, the seats are next to each other."
Person 1: "Oh, phew, I was trooping."
by thebigvinnie May 25, 2014

A particularly heavy period flow for a woman. Named after the British army display on the Queen's official birthday, where the foot guards parade in the bright red jackets.
Even though it was his birthday, the horse guards parade was on. Dave didn't get his birthday shag as his missus was trooping the colour.
by Grumpy Expat June 8, 2019

A very uncommon and rather unheard of way of expressing that someone is going to ejaculate. Most commonly used in forms of humor and irony
by boppo_ August 11, 2020
