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1.
adj. Marked by a comically dated appearance, which at one time passed for "cutting edge" or "high tech". Usually insinuates lesser technological value.
Orig: "Duplo Lego" set, made in 1977.
Iphones make every other cel phone look totally duplo.
by Analog Pixel January 17, 2008
 
2.
Of or relating to being childish in nature.
"STFU tim, god you're so fucking duplo.
by Tony Lalonde October 19, 2002
 
3.
Straight fringe wig wearing Tranny
Duplo
by Blue I legend September 17, 2008