When fish and chips are ordered in a chinese take away and they ask you if you would like salt and vinegar.
Chinese assistant :Salty finger sir?
Chinese assistant :Sal-ty fi nger...
Customer :You mean salt and vinegar?
Chinese assistant :Yas sir, salty finger.
Turd fishing is when the water level in a toilet is very high; or a man's penis is recovering from a hard-on and is still semi-erect and the end of his penis is submerged like fishing bait. Much like fishing but in a toilet so therefore fishing for turds.
"Holy shit man those, toilets are insane I had a nibble from a foot long whopper because I was turd fishing for so long!"