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1.
Someone who is extremely good at making extremely dumb decisions.
"So I told this kid Jim that making crappy submachine guns at home and showing off about it is a bad idea, but he just didn't listen."
"Yeah? What happened to him?"
"He got in trouble with the feds."
"Wow what an electrontube5."
by Tesla February 27, 2005
 
2.
The youngest person ever to build a Solid State Tesla Coil. World renouned for excellent circuit board design work, and generosity
"Dude, you're such an Electrontube5, you just gave me a new car for free"
by Ahmed January 16, 2005