It’s actually pronounced “Pepasha” and is the abbreviation for Pistol-Pulyemet Shpagina - “Machine pistol of Shpagin” (the designer), you know, like Avtomat Kalishnakova (AK) .
16 posted on 02/03/2020 10:36:06 AM PST by Chainmail
(Remember that half the people you meet are below average intelligence)