A slang term for a mechanism put on the back of Glock pistols to convert them to fully automatic pistols. These are normally called switches, and are very, very illegal.
"We got 3 Glocks right here, all with buttons"
"Damn bruh you ain't never gettin out the penlmao"
The duelists faced off, their foils glinting in the sunlight. One held a newer model, complete with a safety button at the tip, while the other sported a more traditional weapon.