a B-allsack is a variation of the word ballsack. virtually having no meaning but whatever you want it to be. Other uses are "
Blue allsack, bigass bus
sack, B L smallsack. B L tallsack, Biggie Smallsack, Bearenstein Ballsacks, Humpty Dumpty Sat on the wallsack,
etc. Asking someone if they would like a Belgium Wallsack.
B-allsack is a name you say to someone who use basically mwaning, wtf dude, your
gay, etc. the tone really emphasizes the meaning.