Go Broncos + God Bless= GB²
2: an acronym for "go back to", commonly used on 4chan. Usually followed by a letter or word in between two slashes (for example /b/ or /school/), to tell one where to go in the poster's opinion. the two slashes stand for how the letters of 4chan sections are between 2 slashes (like /h/ or /b/), representing how they are shown on the URL.
"Yo! I pulled a phat gb2! Your ass is done!"
Examples for definition 2:
"Futanari doesn't belong on /h/! gb2/d/, n00b!"
"You can't spell worth shit! gb2/school/!"