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This is an internet slang emoticon. It is similar in theory to the ubiquitous smiley, however it means:

"Your pet beaver is wearing a hard had and goggles"
"You can't be serious!"

"Yes, i really am, i went to the circus and saw d8="

Translates to..."I went to the circus and saw a beaver wearing a hardhat and goggles".
by James Wilmington June 29, 2006

Words related to d8=

beaver emoticon goggles hardhat slang smiley