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A synonym of the term "Butterface," this term can be used more covertly to express your opinion of a girl's appearance without arousing her suspicion. Inspired by the logo on the famous brand of margarine.
Q: "Hey, what's that party looking like?"

A: "Eh, just a bunch of Blue Bonnets hanging out."
by TD4354 October 16, 2009
a sexual activity in which a person chokes their partner until their blue, and then craps on their head.
"i gave Ellie Mae a blue bonnet last night."
by jeremy January 14, 2004