Top definition
When you are in the shower and you feel the need to stick a toothbrush in your anus (bristle end first) and jump around yelling, "I have a tail, I have a tail."
Man says "Hey honey guess what i just did."

Woman " I don't know. What?"

Man "I just did the william beagle."
by Jeffy Dahmer & Nanook April 16, 2007
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