by Xondak July 8, 2006
 Get the Costellomug.
Get the Costellomug. See also Obsessed, Fanatic, 	Zealot, Cult Classic and Cult Movie
Someone who is completely obsessed with some sort of cult fiction (Example: Lost, WoW, Star Trek, Napoleon Dynamite, Family Guy, Halo, Star Wars, Pokemon etc)
Someone who is completely obsessed with some sort of cult fiction (Example: Lost, WoW, Star Trek, Napoleon Dynamite, Family Guy, Halo, Star Wars, Pokemon etc)
Guy: "Man, Chris is really into Lost"
Girl: "Yeah, like he is Costelloed to it"
Guy: "That's pretty strong to say he's Costelloed"
Girl: "Well, he spends hours researching all the literature associated with it"
Guy: "You're right, he is a total Lost Costello"
Girl: "Yeah, like he is Costelloed to it"
Guy: "That's pretty strong to say he's Costelloed"
Girl: "Well, he spends hours researching all the literature associated with it"
Guy: "You're right, he is a total Lost Costello"
by [<ABSENT>prodigy] July 8, 2006
 Get the Costellomug.
Get the Costellomug. One of the best surnames going. Belonging only to those who are deemed by god the sexiest people in existence.
OMG - is that a costello?
by johnny smith-face March 24, 2009
 Get the costellomug.
Get the costellomug. someone who is very immature and sarcastic at times, but ultimately funny in being so. This person also has sadistic ways of going about things, but can be very serious about certain things. Costellos always push people to do their best. They are also very soft on the inside, and may disguise liking you in forms of teasing and sarcastic comments. All in all, Costello's are very beneficial to have in your life if you know their rules and play by them.
by someswimmer333 April 4, 2009
 Get the costellomug.
Get the costellomug. The act of an official in a correctional facility getting bested by an inmate. Having "the wool pulled over you're eyes". This often happens when the said official always thinks they are right and tries to get an inmate only to have the inmate get one over on them.
Officer Smith is always tring to catch inmate Jones breaking the rules but Jones always costellos Officer Smith. Smith must be sick of getting costelloed all the time
by pacheco1990 June 19, 2012
 Get the Costelloedmug.
Get the Costelloedmug. A Costello Clapp is when after coitus, instead of cumming in or on your partner, you cum into your hand and proceed to smack them in the face with the handful of cum.
by Josh Doane June 25, 2006
 Get the Costello Clappmug.
Get the Costello Clappmug. a monumental musician with a good sound and quality lyrics. recently inducted into the hall of fame. banned from SN for 20 years for changing songs mid song on the show.
by Do you care? March 28, 2003
 Get the elvis costellomug.
Get the elvis costellomug.