Bro Blast
When a friend of yours blows his load in your mouth or ass.
When your buddy tells you your breath stinks and offers to Bro Blast you by cleaning out your tonsils with some hot Llama Milk!
Bro-Blast
A Bro-Blast is where one loves their bro so much that they give them a massive hug from behind, to exert their masculinity and thrust their bro love into their buddies unsuspecting backside.
I love Kyle bro, earlier, dude Bro-Blasted me so hard i swear i couldnt walk for an hour or two. Guy is one chill bro.