The term 'drink noisily' can be summarized by two crossword solutions: 'SLURP' (5 letters) and 'slup' (4 letters). Slurping and slupping are both actions that involve making loud noises while drinking, usually through a straw. Slurping is the act of sucking up a liquid quickly and loudly, while slupping is the act of gulping down a liquid with a loud noise. Both of these actions are considered to be rude in many cultures, but are still commonly done.