"Ruck" means to have the clothing one is wearing folded in disarray. So dresses rucking up would be lifted beyond their hemlines. "Bugshit" means crazy, especially crazily frenetic, for reasons I don't know.
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fbrokebugshitUrban dictionary attests to usage in 2005: More or less means crazy/insane/off your rocker/infathomable, etc..
I take it you’re reading ‘Mr Mercedes’ By Stephen King.
bugshit is an American term for frenetic, crazy, insane. Most parts of the world would say batshit.
Rucking up - pulled and scrunched up clothing.
-Ekips