1) A large penis usually with an African-American connotation
2) A regular customer at a restaurant or bar
3) A large guy who you don't know
1) (Random girl to Becky)
"Oh my god Becky, this guy was frickin huge, I mean, this wasn't just any dick, it was a regi!"
(Line cook to waiter)
2) "Yo get this, there's this one regi who never orders anything besides fries and a salad."
(Movie-goer to friend)
3) "Umm, that regi down in front is blocking my view of the movie, I wish he would duck..."