GMOB 

Grown Men on Bicycles - a derogatory name for men over 30 who ride BMX bicycles aimlessly as if they are casing a neighborhood. Typically used by neighborhood watch associations, but has since been embraced by many men on bicycles in protest of propose discriminatory bicycle ordinances.

Almost hit a GMOB at F and Henderson going the wrong way on the one-way street.

GMOB by bofree June 14, 2016

G-MOB 

a blood represenative gang based in portland oregon and redding california. violent and trill . ( Get Money Over Bitches) or (Give Me Our Blood) allies with bloods and wcr and rollin 60. enemies is ms-13 and 13 st.by: buddy dunez
heat
dizzle

some g-mob fucked up some ms-13 fuckers

G-MOB by Heat 90210 April 23, 2007