Your very best friend. It will not hurt you or talk to you, or even stab you. However, euthanization is eventually required.

It is a cube with hearts on the sides given to you in the valve game portal. You use the cube in only one level and it is shortly thereafter incinerated, yet its small appearance has gathered a cult like basis.
I hit your mom last night, like she was the Weighted Companion Cube.

The cake is a lie, unlike the Weighted Companion Cube.
by J J Bakes November 20, 2007
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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.
by Chavin November 29, 2009
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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.
by dagger_grrl October 3, 2004
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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.
by The Bonesaw October 13, 2013
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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?
by Jbizzle760 November 12, 2009
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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.
by young jeffrey January 31, 2006
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I used to bang Megan but now she's just a formerly enjoyed companion.
by Howell June 1, 2007
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