A klonopin/clonazepam pill. It is yellow and sweet to the taste, similar to a banana. When you eat them, it is not uncommon to suddenly lose your balance, as if you had stepped on a banana peel. This is known as slippin.
"Hey man, got any banana peels?"
"Nah, I heard this man named Leslie does though..."
"A man named Leslie?"
"Yup, he's always slippin."