Initially mentioned on Family Guy, "cleemin" refers to the act of two (or more) people defecating in a bucket, mixing the fecal matter together, and eating the end result. In some instances, rather than eating the mixed product, it may be used as a sexual lubricant. Some partners choose to smear the mixture on their lips and tongue before engaging in passionate kissing.
It can also be used as an exclamation, to express the disgusting nature of something.
"Did you hear about Frank and Judy? They're cleemin on a regular basis!"
"This homework assignment is cleemin!"