a group of boys who all have nicknames for each other and make constant videos of themselves "jerkin" in every immaginable place you can think of. These guys think they're really cool with their own hand sign and won't tell anyone what BGL actually stands for. They throw dance parties all the time and usually use them as another excuse to show everyone how fantastic they all are at jerkin.
Girl: Who is that jerkin on top of the table over there??
Guy: Oh that's just the BGL boys.