files_48488_drilldo.zip

This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons folder. You should end up with a directory structure similar to below:

• steamapps
  • common
    • garrysmod
      • garrysmod
        • addons
          • Drilldo <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• Drilldo/
  • info.txt
  • lua/
    • weapons/
      • drilldo/
        • shared.lua
  • materials/
    • drilldo/
      • deathicon.vmt
      • deathicon.vtf
    • jaanus/
      • dildo.vmt
      • dildo.vtf
      • dildo_n.vtf
      • drill.vmt
      • drill.vtf
      • drill_n.vtf
    • VGUI/
      • entities/
        • drilldo.vmt
        • drilldo.vtf
  • models/
    • jaanus/
      • dildo.dx80.vtx
      • dildo.dx90.vtx
      • dildo.mdl
      • dildo.phy
      • dildo.sw.vtx
      • dildo.vvd
      • v_drilldo.dx80.vtx
      • v_drilldo.dx90.vtx
      • v_drilldo.mdl
      • v_drilldo.sw.vtx
      • v_drilldo.vvd
      • w_drill.dx80.vtx
      • w_drill.dx90.vtx
      • w_drill.mdl
      • w_drill.phy
      • w_drill.sw.vtx
      • w_drill.vvd
      • w_drilldo.dx80.vtx
      • w_drilldo.dx90.vtx
      • w_drilldo.mdl
      • w_drilldo.phy
      • w_drilldo.sw.vtx
      • w_drilldo.vvd
  • sound/
    • weapons/
      • drilldo/
        • rev.wav

Dr. Pepper M.D., guy-mod, Winter, City87, jimidodger12, Sterben, adam.mayer, Leben - Hölle, such_mojo, xDischarged, ✵Анальный✵огнетушитель✵, kawanssilva10, fetter97, [§ICT] Blu [C.I.O.], MeowTank, silasbest03, [Rainbow] TYgayYT, [M], Clem, Schinken, [§ICT] Dom [Founder], Fraktal, The Arrow | ValkyriGaming, The Arrow | ValkyriGaming, fresh_, ItzPanda, SirJoshua, SirJoshua, Dr. Cool, Majestic-- | Hellcase.com, THC Potassium, icollectsponges, kawanssilva10, Ry13y04, Silent Noose, CassetteApe, Just Quik, kashapov.o.r.05, Alias, StormyTerror39, httpjack, tripped wife, End my suffering, XxTASTE_THE_CHEESExX, Son Goku, Maximum Will, Somali, ., Squidler, Squidler +195 others