Shampoo banana 

Local term for the "twin cities" of Champaign and Urbana in Illinois. These two cities are usually just considered one area, but Champaign-Urbana sounds too formal, so some people just say this instead. People from anywhere else usually don't get it. These people often pronounce the S in Illinois as well.

Ted: Where you live?
Lisa: Shampoo banana!
Ted: ...?

Shampoo banana by Miss Leslie April 27, 2006

shampoo drunk

When you become drunk off only a couple of drinks the morning after a gnarly night on the town.

How is duty so drunk off only a couple peach schnapps? Oh dude she got righteous last night she's just shampoo drunk. Oh that's chill

shampoo drunk by germanrodriguez22 July 26, 2014

Shampoo the babys head 

To have sexual intercourse with a pregnant woman

"Come over here 'til I shampoo the babys head!"

Shampoo the babys head by Ralph the Boy Ralphie May 29, 2007

shampoo ambush 

Known in scientific terms as 'Shampupicus Abushulance". It is when a shower cap is pulled over an unsuspecting victim, who is then squirted with shampoo, and then scrubbed verociously with toilet bowl scrubs. This is known to happen to people who refuse to shower.

"Did you see that Seth kid today? His hair was like a mirror!"
"Yeah, we should totally shampoo ambush him..."

shampoo ambush by The Forrest Fire September 23, 2007

shampoo and conditioner ran out at the same time 

no longer have the will to live

“my shampoo and conditioner ran out at the same time”

“im so sorry, please buy more (buy more means gain the will to live)”

shampoo and conditioner ran out at the same time by glyz December 11, 2022

shampoo loop 

the occurrence of multiple shampooings or washing body parts during a shower because you get distracted and forget what you've already cleaned.

Writer: I had a great idea for a book this morning in the shower, but it led to a three round shampoo loop.

Friend: I hate that!

---

Wife: You used all the hot water!

Husband: Sorry, I got stuck in a shampoo loop.

shampoo loop by bomt April 19, 2010

shampoo effect 

A residual drug or alcohol phenomonon in which, during a period after a heavy binge, only a small amount of the recently-abused substance is needed to re-activate your buzz. So named after what happens in the shower when you "rinse and repeat": only a tiny bit of shampoo is needed the second time around to achieve a full sudsy lather.

"Man, I've only had one bloody mary and I feel buzzed!"

"Shampoo effect, dude. You were blasted last night."

shampoo effect by Soave May 25, 2005