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Dining at the Y (DATY) is a euphemism for performing cunnilingus. "Dining" refers specifically to cunnilingus, an act often referred to as "eating out," while "at the Y" alludes to the shape of the receiver's body.
In addition to the sheer comedic value of euphemisms such as this, they may also be useful for situations when discussing sexual activities in graphic detail is inappropriate. Dining at the Y can be shortened to DATY for ease of use in text messaging. For example, you might say, "See you later, can't wait to DATY! ;-)"