Portmanteau of "pre-shitty-farts" , used to describe the farts usually associated with a shit held in for a long period of time, where it is not clear if you have farted or actually shat yourself. also can be called a Russian roulette fart.
"we need to find a toilet, i've got some serious Presharts"
"that was a dirty Preshart I heard over there"
When you feel a fart coming on and you also have to pee, when you go pee, you let out the "what could have been fart" and it turns out to be a shart but you are thankfully on the toilet at the right time.
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. PenguinBooks,1992. p. 38)