robitrippin
If you're a particularly desperate individual, taking large amounts of Robitussin can make you higher than a kite, more tired than you've ever been, and unable to walk a straight line. Hallucination is rare, but visual impairment is common. Don't drive or operate machinery.
The man started robitrippin and thought he could fly.
robitrippin
Including Robitussin (the poor man's hallucinogenic) in any cocktail of drugs used for recreation (including, and usually meaning alcohol). Some users report to have experienced a mild hallucinogenic effect by doing this.
"Hey, man. I was robitrippin and suckin' on this frog's ass once and, like, I thought I saw jeebus!"
robitrippin
Can you say "INNAY" as in Narcotics Anonymous
Dude while I was on house arrest I ordered some pizza and paid the pizza-chaffeur some extra nuggets to stop by Walgreen's for a high risk drug transaction involving the purchase of some 100% pure, "the stuff that killed Elvis", Robitussin caplets where 20 kapzen yo AZ means more than you got blasted it means you be robitrippin.
Robitrippin
the act of trippin on "Robitussin" or on cough syrup
Joe Shmoe:"damn what up with that bitch?"
John Smith:"Oh, she be Robitrippin"
John Smith:"Oh, she be Robitrippin"