Not quite exactly, guy in guy, or guy on guy. It's more like guy with guy or guy with guys. Semi-naked to naked men hanging around brushing up against each other and checking each other out.

What many, many females fantasise about, much like guys' attraction to girl-on-girl action, only this version is far less socially acceptable and thus kept a closely guarded secret, even more closely guarded than masturbation. Many teenage girls in particular have a special attraction for punk/emo-type guys getting together (see: emo boys who kiss)

The most basic and predictable version of the male species, identifiable by an omnipresent baseball cap, reluctance to consume any alcoholic beverage other than beer, and general lack of conversation. Usually spotted in herds.

Shortens to: GBG.

a phrase that can be used to replace any or all nouns and verbs in a sentence.

showing up and leaving immediately

When another car is parked in a large parallel metered parking space and is some distance from the meter; you park closer to the meter such that it looks like the other person squeezed into your space, rather than that you squeezed into their space thereby forcing a policeman wielding parking tickets to determine who was the "good guy" and who was the "bad guy."

A mistake in logic that people make where they lump all people into two cadagories good guys and bad guys. This mistake is made by police,military and other people who have not learned to think.
In fact there is no one who is all good or all bad.