For profit companion 

A Prostitute

It’s easy to acquire a for profit companion in the red light district.

For profit companion by Tigersharkcub July 1, 2020

Mysterious Road Companion 

While traveling for a long period of time, and a car catches up to you, but likes your driving and speed enough not to attempt to pass. After miles you look through your rear view mirror to check up on your new road companion.

A typical aspect of road companion is day dreaming conversations with your road companion about other crappy drivers.

Person: How was the driver here?
Traveler: It was pretty long, but I had a pretty cool Mysterious Road Companion to keep me company.

Mysterious Road Companion by Chavin November 28, 2009

long time companion 

a sometimes euphemistic term used to describe one of two people of the same sex who are in a commited, longterm, co-habitational relationship, and who are often presumed to be lovers.

myrtle and her long time companion, susan, retired together on Cape Cod last year.

long time companion by dagger_grrl October 2, 2004

late night companion 

a person who bakes you late night goodies and keeps you company. You do not have to pay her to leave.

Becky Young is a great late night companion. She made me some pizza, ice cream, and kept me company all night.

late night companion by The Bonesaw October 12, 2013

designated driving companion 

The poor sob who gets to keep you company while you're DD-ing for people. Ideally, a hot girl who you can laugh at the drunks with.

Hey girl I need a designated driving companion, you in?

designated driving companion by Jbizzle760 November 12, 2009

Temporary Male Companion 

How I introduce my boyfriend to other people when I'm pissed at him or when a breakup is inevitable.

Jake: Hey Jeff! Well well well, who do we have here?
Jeff: This is Neil, my temporary male companion.
Neil: Not very nice.

Temporary Male Companion by young jeffrey February 1, 2006

formerly enjoyed companion

The politically correct term for your slut ex girl friend.

I used to bang Megan but now she's just a formerly enjoyed companion.

formerly enjoyed companion by Howell June 23, 2007