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1.
Similair to the bionic seahorse the Big Dan is wen a male inserts his penis in a females nose an forces her to gargle his testicles, resembling the laugh of the infamous "Big Dan".
My balls are still soggy from that Big Dan
by o snapple.com May 12, 2009
 
2.
A strong, bold, sassy, smart woman: usually a shorter version of the name Danielle.
"Big Dan is amazing, she got her BA while being a single mom!"
"She's a big dan, look at all those guys staring at her!"
by K-dizz-in-da-hizz April 27, 2008