An utterly unsatisfactory event that has happened in school or in any other pubnlic setting: Originates from the spanish verb "cagar" meaning to take a a long and refreshing crap.
Damn pimp, that test is gonna screw my average the F**k up! What a cag!!
I had so much to drink last night night, then I pulled some utter munter (qv). Woke up this morning and it was all I could do not to cag my guts up over the repulsive truffle-hunter.