When you eat a large amount of food and soon after feel really tired

When a reply to a tweet gets more likes than the tweet it was replying to, usually indicating the unpopularity or stupidity of the original tweet

The general feeling of lethargy and well-being experienced after eating a satisfying meal. This phenomena is particularly triggered by foods high in carbohydrates and meats containing the amino acid tryptophan.

When you become sleepy after eating food or getting some booty.

When you call in sick to work but aren't really sick

a sexualy transmitted infection.