Easy as shit
Not to be confused with easy as pi, easy as shit generally refers to a problem that can be solved in less time than an average person takes to shit.
Alice: Hey, did you finish 4b on our calculus homework?
Bob: Yeah, it was easy as shit. I finished it while Reece was taking a dump.
Bob: Yeah, it was easy as shit. I finished it while Reece was taking a dump.