Mainly another word for a dick head. Like a unicorn, dickacorns are thought to have a dick smack dab in the middle of there forehead. They are an all male species (w/t a few exceptions) but unlike the gracefull unicorns who are (sadly) not real/extinct, the dickacorns (sadly) still exist.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.