The perfect amount of beer left in a can that is just over the acceptable limit that people who finish their beers would allow. The TL Amount is unacceptable and should be called out anytime one is found. Possible times include rounds of DDD, usually resulting in many TLA's, and Bowser coming in 4th place on the rainbow road.
TLA also coincides with Too much Left Amount.
When you do the thing with the thing, and leave a TLA sitting around. T is known for creating the TLA.