When a beautiful woman alters her face in a cute, goofy or otherwise wacky way by "pulling a face" (crossing her eyes, sticking out her tongue, waggling her ears, etc). Sometimes it's an awkward moment. Sometimes it's a romantic moment. sometimes it's both. Regardless, it's adorable.
Although it can momentarily interfere with her attractiveness, it does not in any way diminish it. In many ways it may even accentuate it. Thank you to Esky.
Jack: "hey babe - you're looking hot today."
Jill: "...Bllpffft" (pulls a face - drawing on a mustache)
Jack: “such a babe.”
n. A drawer containing information such as letters, deeds, and photographs about one's sordid past or secret identity; inspired by Don Draper from the hit TV show Mad Men