a person who is objectively attractive or seemingly “normal” but is secretly a huge nerd/really intelligent; or has an obsession towards something that isn’t mainstream.
by btl0913 December 16, 2023

Finishing in a girls buttcrack while she is sleeping, without her knowing then pulling her pants up and going to sleep.
by Chasin Sugsi April 15, 2025

by anonymous December 9, 2024

Someone who you assume is just a normal guy because you only see him in hoodies and baggy jeans. Only to find out later when its summer that hes actually jacked as hell.
Friend1: Yo you know Jake?
Friend2: Yeah what about him?
Friend: Bro look at him on the beach.
Friend2: What the hell? Since when was he that jacked?!
Friend: He's a sleeper bro
Friend2: Yeah what about him?
Friend: Bro look at him on the beach.
Friend2: What the hell? Since when was he that jacked?!
Friend: He's a sleeper bro
by Sleeperagent1776 March 1, 2021

Someone who has consumed a large amount of alcohol and suddenly leaves the room or party to pass out without notice.
by Modkrew16 December 28, 2013

An individual who remains on "standby", awaiting the "activation" term from another individual in a relationship or fresh out of one. This term is usually indicative of the contacter wanting to participate in sexual relations.
by Mrcrump27 September 13, 2021

A part of the cab or an attachment to a semi-truck often used for loads that travel a far distance. The sleeper contains one or two beds that are of decent comfort (in my opinion) especially with blankets. For two-person trucks, there is usually a bunk bed so that you and your passenger can sleep.
by trhsrthsrh April 7, 2021
