[per-soh-nah nohn grah-too-i-tah-tuh]
N., the person at any food or drink-related group gathering that consistently feigns ignorance and under-contributes his/her portion of the overall group tab; examples include: forgetting to include taxes, tip, soft drinks and any shared entrees, appetizers or side dishes in the final bill reckoning
This is typically a regular occurrence for the offending party and therefore an extremely tough habit to break. For fellow group diners, it is especially awkward to broach the topic of underpayment with the perpetrator (for fear of seeming petty), ... an omission which unfortunately only seems to perpetuate this odious behavior
In many cases, the underpayment is often accompanied by a calculated diversion (an unexpected phone call, a trip to the restroom, spontaneous conversation or an early departure) to avoid detection.
See also tab averse and tab jumping