verb: the act of harvesting ball sweat with one's middle and index fingers, then placing those fingers under an unaware victim's nose.
Neil duck buttered Jess so badly after not showering for 3 days.
I have some killa DB today!
"Man! I've accumulated enough duckbutter to garnish a bagel!"
Person 2: "I only have some Duck Butter; however, we should probably not use it."