a) an exclamatory phrase used to portray any and all emotions, or lack thereof.
b) the extremely overused but beloved saying created by Rico 'Optimus Prime' Restirino.
c) often followed by the phrase 'n shit.
d) The awkward literal meaning, which refers to feces, and genitalia. (usually after fucking a bitch in her ass)
Derek: Rico you just got ur head blown off in CoD 5.
Rico: yeah i suck
Nate: Shit on ur dick rico
Rico: yeahhh shit all over my dick 'n shit
*just stubbed toe*
"Shit on my dick!!"
*just fucked a bitch in the ass*
"Shit on my dick! anal is DIRTY"