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1.
Ejaculating in ones pants. Referring to when you wash your pants and you leave gum in it. When you take it out, it's a slimy mess.
"Dude, I just gave my girlfriend melted gum". "No way, I bet she was pissed when she went to grab her phone out of her pocket"!
by EagerMcBeaver772 October 26, 2011
 
2.
A gum that is melted.

Meltedgum, also known as a pixel on Runescape.

Gum that you melted in the microwave.

Put a gumball in the microwave, it explode, gets burnt and melted.

Aka Meltedgum.

by Mysti March 10, 2008