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11.
The person in a group of two that is the lesser. He/she is typically lacking that umph that the hero gives, and gets stuck with red tights. Many sidekicks took too long to develop their social skills, and were major douche bags.
Sean: "Robin is the perfect sidekick. He just sits there in red tights while Batman jumps and does ninja stuff."
Larry: "True that."
by Leonitus March 25, 2007
 
1.
A popular contraption made by T-Mobile, which can be used not only for making phone calls, but for AOL Instant Messenger, email, text messaging, internet, and several other features. Most popularly used by teenagers to constantly communicate with their friends at ALL TIMES, including while at school, in the car with parents, in movie theatres, and even at social gatherings. Basically, its a social life in a phone.
Boy: My blackberry's so cool, I can play games in class.

Girl: PSHHH my sidekick's so much better, I can check my MYSPACE in class!
by danielle rose <3 August 11, 2005
 
2.
A friend/associate of a more popular, charismatic person. The sidekick gains most of his/her acclaim from merely being connected so closely to the more powerful acquaintance. Sidekicks can be found anywhere from comic books (where the term began) to the workplace and schoolyard.
Neil: Is Dan really that popular a guy? Most people in the office just talk to him because he's Ron's little sidekick.

Gina: The two of them are inseperable, you have to give them that.

Neil: Oh, I'll give that little Dan something he won't soon forget!

Bartholomew: Like the Baxter Account?
by Diggity Monkeez March 14, 2005
 
3.
t-mobile (danger) sidekick.
Popular PDA phone.
the t-mobile sidekick is lindsay lohan's favorite cell phone.
by Gaunt911 August 06, 2004
 
4.
the phone every myspace addict,scene queen/king,rich bitch kid,young celeb e.g paris hilton,and internet celeb has/wants.
it's a phone for the youth
and the flipping action is real sweet
dude without sidekick "omg what the hell is that?"
dude with sidekick "yo its a sidekick dawg!"
by Mayumi April 12, 2007
 
5.
the superhero's b*tch
Batman: Hey B*tch! Get over here and DO something!
Robin(the sidekick):*sigh*, what the hell...i guess
by vainglory January 16, 2009
 
6.
Made by danger sold by t-mobile. One of the most popular phones to the urban world. And mostly purchased by myspace addicts.

Its all about the sidekick 3.
if you don't gotta kick to flip.. you might as well flip a tit.
by 0hithinKtHeyLiKeMe August 30, 2006
 
7.
A popular phone made by Danger Inc. and offered by T-Mobile which features a Web browser, email, instant messaging as well as being able to talk to others.

Its featured on Nappy Roots' song "My Sidekick"
"I think she want it"
how you know..?
"I know because my Sidekick goes.."beep beep beep beep beep..."
by mil-town November 07, 2006