Someone who willwalk to a bathroom on the other side of their office building to take a dump, even if there is a bathroom closer. The reason for this is so that no one in their side of the building will know if they stunk up the bathroom.
Tyler: "I was going to the bathroom and in walked Steven. I don't know why he always uses our bathroom, there is one right next to his office!"
Ben: "He's a migratory pooper. Hold your breath if you see him in the bathroom!"
The name given to hot peppers -- usually Habanero or Thai -- found in primarily ethnic food that don't agree with your digestive system and inspire an immediate trip to the bathroom to expel your meal soon after its completion.
I had the best Mexican food last night but those migratory peppers they put on my fajitas sent me to the can right afterwards and burned as much on the way out as on the in.