Gall is used as a nickname for anyone one with the surname Gallagher. People with this nickname are usually hipsters and are into hentai and anime. Altough not sporty they can be seen walking but prefer to spend time playing games in a dark room. They also are know for their bed skills and licking out abilities.
An absolutely foolproof way to keep minors from viewing content deemed "too mature" for them to watch.
Billy: "So I was trying to watch some videos for an M rated game, and I ran into an age gate, so I put in my real birthday. SOMEHOW it managed to figure out that I am 12. CURSE YOU AGE GATE!!!"
Bill: "Fucking age gate! *quick scroll* THERE! I was born on January 1, 1904. Fuck you age gate."