"Yo man its kyle, you guys bro'ing out?"
"Yeah dude, we are "bro'ing out" come up to north and bring frat sodas."
To hang out with other bros. In order to "bro out" one must be with at least 1 other bro in a social setting. If you take yourself too seriously or act faggy then you are not bro'ing out. If you are working or doing schoolwork then you are not bro'ing out.
A typical scenario in which one would be bro'ing out would be if some bros were in the basement of the cunthouse drinking frat sodas and smoking p-funks. Extra broing points if hoes are present.