a hallow tube that you fill with dryer sheets and exhale smoke (usually of the mary jane type) so your apartment doesnt smell like weed or your parents dont catch you also is called an asshole
Joe: dude lets blaze
Mark: wait man where is the dude tube?
Joe: o shit yeah dont wanna smell the place up
Someone, necessarily male, who is completely full of themselves and a total dick to boot. A low level of intelligence and a big mouth are also traits attributed to the common dude tube.
Can be utilized with added comedic sensibility when referring to an openly gay man exhibiting the traits outlined above.
Arnold Schwarzenegger is a fucking dude tube.