The beer effect occurs when you are in a restaurant with someone you don't know that well, and everybody gets like water or diet coke, until you order a beer, and everybody changes their mind and gets beer too :-)
Paul: - "I'll have a diet coke."
Sarah: - "I'll have a glass of water."
Martin: "I'll have a beer."
Paul: - "You know what, i'll have beer too. I don't want the coke.
Sarah: - "I'll have a beer as well"
Martin: "Yeah. Thats the beer effect."
The though that an action done amongst men might seem kinda gay, but as long as you add beer, its not gay anymore.
Kyle - «Yo me and brodie went on a joke together and watched the sundet on top of a mountain»
Quandale - «Lol thats kinda gay»
Kyle - «We had a couple of beers on the top»
Quandale - «Oh, thats the beer effect bro»