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1.
When two objects merge together creating one super-object.
The three pancakes melded together while being cooked, creating a trifectum of breakfast deliciousness.
by The_Truth_Man February 17, 2009
 
2.
Melded (n.) - A complete fuck-up of life. A lack of common sense combined with regretable decisions familiar mostly to the state of drunkeness while being stoned.

Melded (v.) - To do something so retarded that afterwards there is no answer to questions such as "Why the hell would you do that" and "How did you manage that one".
"Oh you really melded that one up"

"This whole day is really melded"
by Ghig April 28, 2007