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When someone wears business attire on the upper-half of their body, and wears comfortable-to-them clothing on the bottom-half.
In line with the "mullet" which is business in the front, party in the back, he decided on a billen' outfit for the first day of school: a button-down shirt and tie on top, but with athletic pants on bottom.

Because it was a zoom meeting, a billen' outfit worked for the morning call.
Billen' by Sleazy_P August 17, 2022

Chillen with my billen 

Chillen with the billen means your chilling at home watching YouTube or drawing, in other words your doing absolutely nothing. If your talking to a friend about it means your just doing the same as normal. Another way to say it, is chillen with THE billen.
Friend #1: What’s up man?
Friend #2: Not much, just chillen with my billen.
Chillen with my billen by Chezitss December 21, 2019

Cheesy bellend 

Cheese like substance situated in the foreskin area of an unwashed dick. Smells like rotten cheese, looks like rotten cheese... a Cheesy Bellend
Cheesy bellend by dikke piele November 28, 2004

BillOntario 

An overweight homosexual Canadian who spends his entire life posting on ESPN message boards, with the sole purpose of interrupting conversations between other users by posting messages of extreme length and massive character count.
BillOntario: FACT.

Other User: Time to leave. Bill is here to spam.
BillOntario by Bucman October 19, 2011

billet doux 

a personal letter to a loved one expressing affection.
My boyfriend wrote me the sweetest billet doux during our anniversary.
Tip of the penis.
Can also be used as an insult.
Only Britain has been blessed with this amazing word so far, but the Gods are trying to find a way to spread it around the entire world.
Random: I dress up as death and point at old people as they leave the bingo centre.
Me: You bellend.
Bellend by MaxisStrife December 24, 2015