Any informal surgical procedure conducted by friends or family with unorthodox, unclean and oftentimes inadequate tools.
Usually, the said procedure relieves very little symptoms and leaves you in more pain than when you started.
Bloke 1: “Asked my mum to get a massive splinter out of my foot. She used toenail clippers and just ended up pushing it in further.”
Bloke 2: “Ahh the old Trench Surgery didn’t go as planned hey?”