Despite how it sounds, it is actually an adjective, used to describe something you like or to give approval.
As a noun, dopey sauce refers to an incredibly rare substance made from Nancy extract mixed with ginger ale. It is known for its aphrodisiacal properties and adds 69,420 points to your sassiness. May cause stomach upset in some people, causing you to postpone IKEA dates.
The experience of negative symptoms due to withdrawl from medication, typically opiates (herion, morphine, opium.) Symptoms may include nausea, headache, insomnia and restlessness. The term is not limited to opiate narcotics.
Being dopesick, the only time I've slept in the past few days, is when my body reaches the point of physical exhaustion. Weee!