A sexy guy is someone who is male or someone who defines as a man/boy who is very good looking.
Mollie, "Ooooh He is sexy!"

Katie, "Yeah he is, he's a sexy guy."
by Mollie_A13_16.10.18 February 13, 2019
A guy who is incredibly sexy... Like beyond anyone else in your phonebook
Tom Cole is a Very Sexy Guy
by Gnf2020 September 21, 2020
really tumblr famous guy. he has like 175843 followers. he also promotes and answers all your messages!
James "Have you heard of that really tumblr famous guy?"

Simon "Who? sexy british guy?"

James "Yeah, thats him!"
by askjord May 15, 2011