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2.
A crush on someone you've met on Tumblr or a crush on their blog.
Anne: I have a Tumblr crush on someone I've met online.
Billy: I have a Tumblr crush on your blog.
by billy72 January 14, 2012
 
1.
When one develops a "crush" or extreme liking to someone's Tumblr page and imagines this person would be their soulmate in real life.
"Meaghan has a huge Tumblr Crush on OMGREG."
by meggers27 January 17, 2012