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!
v. the act of squirting a travel-size bottle portion of shampoo up one's anus, and then proceeding to bend over a willful and participating lover's head, from which the carrier of shampoo releases it on their head, giving them a thorough and affectionate cleaning.
When I got back from my trip, I was dead-tired and just wanted Melissa to give me a good shampooping; she refused of course, that fucking prude!
When you take a bottle of shampoo and stick it in your ass, squeeze as much of it into your rectum then blow it all over some bitches hair. Resulting in a mixture of shit, shampoo, and hair.
So you wanna come over and I'll give you a good ole fashioned Shampoop.