1. any one of a number of words that can be used as filler in sentences and replacements for words such as shit, sweet, holy cow, holy moley, or just about anywhere in a sentence
2. the sounds of a mentally handicapped child walking the halls of your favorite school building
Dude, look at the waydo over there!
We had such a waydo time last night!
That vacation was waydo!
Alternate Spellings: Wado