a strong mixture of loratab and Vick's Nighquill that results in spontaneous bursts of inebriation that could potentially cause a person to loose their pants.
Klope has an unknown origin and no one is quite sure what it means exactly, however, it is often used in the sence of stealing. Klope or klop is mostly used in Norway as the pronouciation is rather different, like "Keh-loh-peh" said quickly. It can be used as "stealing" or in the sense that you'll mess someone up, as shown in the second example.
It all starts after you've jacked off: you have put your pants back on, and are minding your own buisness when you get this cold slimy sensation/tingling down your left leg. Then you realize that your dick has just coughed up another drop of cum, and its slowly crawling down your legs. You start to limp, trying to make sure it doesn't stain your pants, while acting normal. You can't do anything. Your stuck. You've just become a victim of a leftover koppel.
"oh dude i was jackin it between math and latin and i thought i was alljuiced out...but no, half way through latin i fell victim to a leftover KOPPEL."