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1.
An amazing thing to randomly say.
Don't forget to bring a towel
by Chr15 July 28, 2006
 
2.
Something much more than a "random saying"
Used as common slang among reefers
Made popular first heard] by Towlie episode 8 season 5
"wanna get high? don't forget to bring a towel!"
by towlie:D October 21, 2009
 
3.
Also, said as a response to, "I'm gonna go drop the (Cosby) kids off at the pool." as a way to remind someone to make sure there is toilet paper.
Person A: "I'm gonna go drop the Cosby kids off at the pool."
Person B: Have fun, don't forget to bring a towel!
by JARNYC January 23, 2008