Can mean 2 things in the Bay Area: one, can signify cops, police etc. two: can signify the 1984 to 1991 ford mustang 5.0 nicknamed 50 (fifty) mostly used as a sideshow car or a cheap getaway car when pulling licks.

The number between forty-nine and fifty-one.

Being half of 100, not loyal or trusting

The 50 is a group of gangstas from the 2250 region. They are notorious for drive by shootings in enemy territory such as there fierce rivals the 56( Peninsula) the 51 (Kinny Ratz and Avoca) the 57 the second strand of the Peninsula but the most fierce rivals the 59 (Wyong, Wadalba area). The 50 contains suburbs Calga, Gosford, East Gosford, North Gosford, West Gosford, Erina, Kariong, Kulnura, Lisarow, Lower Mangrove, Mangrove Mountain, Matcham, Mount White, Narara, Niagara Park, Peats Ridge, Point Clare, Somersby, Springfield, Tascott, Wendoree Park, Wyoming.

This is mid-grade weed that usually sells for upward to $50 for 7 grams, hence the name 50. It usually provides a much heavier and cleaner high than schwag, with very few seeds per bag.

American Browning 50 caliber heavy machine, belt fed, designed before WW2 and still in use today.
Used on our WW2 fighters and bombers, ships, amoured vehicles or with a tripod. Its power could chop trees in half.

In Australia, a $50 bag of weed and to a lesser extent, other drugs.