I have no idea where these came from or what they meant even but....
Moded! Around 4th or 5th grade If someone got dissed or if someone was proven wrong by something we would say, "oooo...you got moded" (rhymes with coded). Than if it was really bad we'd sing "moded coroded your butt is loaded, moded coroded your butt exploded".
Scratch! Same thing as moded but at an earlier time around 2nd or 3rd grade if someone got dissed or if someone was proven wrong than we'd lift our chin and do a scratching motion on our neck and say "ooo...scratch".
No sh*t sherlock! When someone states the obvious and Psyche!, just like JerseyJ said but sometimes to say it to play around like, she's/he's cute....psyche! or when you give a high five and take it back than say.....psyche!