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1.
One-billionth of a crush.
"Man, she's so nice. I've a nanocrush on her."
by GoogolX September 17, 2013
 
2.
n. A short lived crush, usually on a stranger, that lasts only as long as the encounter. It may develop into something more after repeat encounters. Also see stranger crush
1. A cute guy on the subway complimented me today on my shoes and I a developed a nanocrush until he got off.

2. Dude, my nanocrushs on the barista are not fading. I might have to ask her out.
by a_wrighter March 24, 2009