The act of drinking a beer without finishing it. 'A Cammo' is often identified while removing the empty bottles on the following morning and residual beer remains in one or more bottles. The person(s) executing 'A Cammo' are usually ridiculed for their lack of masculinity.
*Person 1 is cleaning up empty bottles in the morning and notices residual beer*
Person 1: "Fuck, it looks like Matt pulled A Cammo last night. What a fucking homo!"