Shampoo that while it sound like it would be pleasant when you read the label in a store, really sucks big walrus cock when you take it home and use it; forcing you to dump it in the toliet or down the lavatory drain and purchase a new bottle of some other variety.
Not to be confused with shampiss, shampee, shampiddle, or shampotty.
{Mike, at store}: Hey Chris, didn't you just buy a big-ass bottle of shampoo a day or so ago?
{Chris, at same store}: Yeah Mike, but it was shampoopoo! It was Suave Lotus Pedals but it really smelled like shit so I got rid of it!
"Shipoopi" is the title of a song from The Music Man, a Broadway musical written by Meredith Willson.
"Shipoopi" is also a portmanteau of the words "shit" and "poopie"; which is perhaps why children enjoy performing the "Shipoopi" song in Willson's musical.
lyrics from "Shipoopi":
Now a woman who'll kiss on a very 1st date,
Is usually a hussy,
And a woman who'll kiss on the second time out,
Is anything but fussy,
But a woman who'll wait 'till the 3rd time around,
Head in the clouds, feet on the ground,
She's the girl he's glad he's found,
She's his Shipoopi.