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1.
To indulge in alcoholic consumption the following day/night after getting completely shitfaced the night before. Usually it's easier to get drunk that next night.
Kate and Lauren are shampooing in the fratmosphere again tonight!
by Fropaholic June 23, 2009
 
2.
Sham-pooing, Verb: The act of lathering your scalp whilst taking a wild poo.

Also a reference to a homeless person (sham) who is dirty and never showers. The irony!
I took a massive sham-poo the other day it was breath taking, like having a water birth, including full dilation and crowning.

I can't believe I'd never tried sham-pooing before!
by papashivo April 17, 2009
 
3.
Engaging in sex while shampooing your partner then Mid-coitus, one person bites the neck of the other, locks their arms and legs down and goes into a deathroll, all while maintaining insertion. Upon completion the man finishes in the womans ear and then proceeds to mushroom slap the woman being sure to leave a print.
I heard Candi and that Tranny Lizzie shampooing last night, and I saw the print to prove it! I'm gonna have nightmares for weeks...
by Alejandro Reyes August 12, 2011
 
4.
The act in of getting off while shampooing someone elses hair. a very clean fetish.
"we just kept it clean last night and stuck to a little sham-pooing"
by SiNister PiGeon December 20, 2009
 
5.
getting carried away having 'fun' in the shower by your self
sorry i was soo long i was busy shampooing
by Prosititue user November 18, 2009