A north london slang term for a shotgun. Its derived from the American slang term for a shot, which is known as cap and gun, which is known as a gat. All it is, is cap & gat joined together to create capgat
E-Man: Yo Tho-maz! pass da capgat bruvs we need 2 blap up sum man dems!
Tom: I told ya not 2 call me Tho-maz
*passes the capgat and starts listenin to Led Zeppelin*