noun. A wee wee-wee.
Related terms: micropenis, microdick, microcock, micropecker, microweenie, microwang.
Real citation: "Figures microtallywhacker....your boy Bush is backed into a corner and your only response is some nonsense about the devil's spawn. Ignorant."
(JO, March 22, 2004, http://www.thebackpacker.com/trailtalk/thread/29912,-1.php)
Made-up citation: "According to George Carlin, wars are started by the microtallywhackered against the macrotallywhackered."