If you're referring to a project or feature that combines elements of Garry's Mod with the PlayStation Portable, here are a few speculative ideas:
If you want the authentic Garry’s Mod experience on your PSP screen, you cannot run it natively, but you can stream it. This requires a high-end PC running GMod and a PSP with and Custom Firmware . gmod psp
However, the search volume for "gmod psp" isn't generated by nothing. It stems from three specific phenomena: If you're referring to a project or feature
: The PSP features 32MB to 64MB of RAM, which is insufficient to run the Source engine required for Half-Life 2 and GMod. Proprietary Software you cannot run it natively
"Weird," I muttered.