Noun, the most awesomely, indescribably cool person in the universe, possibly a higher authority than God himself. Used to compare to something or someone immeasurably awesome or cool. Usually used in conjunction with the prefix "Get on.." as in "GET ON DEETUN!" to express a feeling of immense pleasure or excitement. Deetoning/Deetuning/Deetaning/Deightoning/Deightuning/DEETUNNNNIN' can be used as the adjective equivalent of Deetun to describe a person or object.
*You well pimp slapped that suckah, you are well Deetun.*
In this case Deetun is used as a simile -
*Wow, Bruce Forsyth is almost as Deetun as me!*
In this case Deetun is included in the phrase "Get ON DEETUN!" -
*Dude I saw just that chick's thong!.. GET ON DEETUN!!*
In this case Deetun is adapted to Deetoning in the adjective form to describe an object -
*My new iPhone is WELL DEETONING!*