A party where only the bros are invited by the host. These Bros are obviously expected to be wearing their respective pinnies since they are in fact bros. Each invited member is advised by the host to bring a "+1" to the party with the host's approval. To properly qualify as a +1 the girl must be either:

a) Your girlfriend
b) A lady friend from outside of the bros' school.
c) A younger girl

There are also a few important things to remember when having trouble selecting a girl to be your +1.

a) It is important to note that the +1 you bring does not necessarily have to be a girl that interests you. You can hook a bro up. "Sharing is caring."
b) Nobody cares who you bring. It is a night of bro-bonding at its purist so time should not be spent worrying about if the girl is acceptable to be seen with in front of your friends. Bros are bros. And as long as bros are happy with who they are hooking up with then the bros' bros should be happy too.
c) You should never make a girl your +1 if she cannot spend the night at the host's house because your chances of scoring will be significantly lowered.

*Some variations for the rules exist and those may be used at the host's discretion. (ie: "A public school girl may only qualify if her family income is over 100k per year")

*It is strongly encouraged that at least one bro has a camera so that photographs can be taken to document the night on a facebook photo album. This album should always be called "It's like we're guys from Delbarton (and all these girls are named lynn)"

Bros +1 was a good idea until all those girls our age with a boyfriend from our school came.

Bro#1: Yo bro you hittin up bros +1 night on Friday?
Bro#2: Chill bro. I'll be all up in that. And I'm bringin a +1 who is easily the sluttiest froshy in her school that is not the school we go to and I don't even wanna tap that bitch, but I figured I'd bring her to share with my other bros.

Matt the British bro is hosting a bros +1 night. Should be kickass.
by BigBadBroJohn May 22, 2008
A party where only the bros are invited by the host. These Bros are obviously expected to be wearing their respective pinnies since they are in fact bros. Each invited member is advised by the host to bring a "+1" to the party with the host's approval. To properly qualify as a +1 the girl must be either:

a) Your girlfriend
b) A lady friend from outside of the bros' school.
c) A younger girl

There are also a few important things to remember when having trouble selecting a girl to be your +1.

a) It is important to note that the +1 you bring does not necessarily have to be a girl that interests you. You can hook a bro up. "Sharing is caring."
b) Nobody cares who you bring. It is a night of bro-bonding at its purist so time should not be spent worrying about if the girl is acceptable to be seen with in front of your friends. Bros are bros. And as long as bros are happy with who they are hooking up with then the bros' bros should be happy too.
c) You should never make a girl your +1 if she cannot spend the night at the host's house because your chances of scoring will be significantly lowered.

*Some variates for the rules exist and those may be used at the host's discretion. (ie: "A public school girl may only qualify if her family income is over 100k per year")

*It is strongly encouraged that at least one bro has a camera so that photographs can be taken to document the night on a facebook photo album. This album should always be called "It's like we're guys from Delbarton (and all these girls are named lynn)"
Bros +1 was a good idea until all those girls our age with a boyfriend from our school came.

Bro#1: Yo bro you hittin up bros +1 night on Friday?
Bro#2: Chill bro. I'll be all up in that. And I'm bringin a +1 who is easily the sluttiest froshy in her school that is not the school we go to and I don't even wanna tap that bitch, but I figured I'd bring her to share with my other bros.

Matt the British bro is hosting a bros +1 night. Should be kickass.
by BigBadBroJohn May 21, 2008

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