Refers to something that is extremely easy to understand or complete.
Man, Spanish is cupcake shit for me!
(as a man) to pee sitting down so that noise is minimized
A reference to Switzerland's ban on peeing standing up after 10 P.M due to noise complaints by neighbors.
Since I didn't want to wake up my tired father, who would beat me if I ever did, I took a swiss piss that night to avoid any sound.