A Riley is a person who can't make up their own style and has no personality. They talk about other people behind their back and are at heart mean. Having a bad reputation for asking out almost every guy in the grade, she is an annoying person who can't be original. Another word for a BIG nerd.
by Y0uRm0M143920 March 28, 2008
Get the Rileymug. by Codename4444 May 7, 2009
Get the Rileymug. Riley has a huge dick!
by Yee the ye yer December 10, 2018
Get the Rileymug. Someone with little to no understanding of basic human anatomy, let alone the functionality of most things for that matter. Will often ask you to engage with bizarre hypothetical situations.
Riley: Apparently, your eyes are supposed to adjust in the dark?
Anon: That's why your pupils expand, Riley.
Anon: That's why your pupils expand, Riley.
by Colourfluff August 23, 2019
Get the Rileymug. If you know a Riley you are real lucky, most Riley's have ice blue eyes and are really sweet. She has short hair that is a brunette color. She is nice and would do anything for her best friends. She loves sports specifically softball. She thinks she is ugly but is sexy as hell. She is some what mysterious but knows what she wants. She is really interested in a relationship but is to scared to ask.
by SLOTHED OUT 1 November 27, 2018
Get the Rileymug. 
A sexy lad who loves sport/motorbikes and cars plus has excellent style a Riley is an awesome person who is strong and has an annoying brother or sister is an allround great person
A Riley is a great person
by Jeff00000001111111 July 4, 2016
Get the Rileymug.