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The act of masturbating before bed, 'gay' referring guys playing with their PENIS etc.

Made famous by Ultimate Force, an English TV show about the SAS in which Cpl Ricky Man has an inside joke with Cpl Louis Hoffman - he generally follows it with 'they love it, they do, they love it'
well this is a paraphrase of 1 scene from Ultimate Force...

Cpl Ricky Mann walks in camera shot carrying Vaseline

Ricky: Here, this should work on the C4 detonators, and get you through a couple of games of Gay Before Bed"

Cpl Louis Hoffman: *smirks immaturely*
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