What is it called when some pronounces their “t” sharply?

Question

What is it called when people pronounce their "t" sounds so sharply that it sounds like the sound "eh" comes after the "t" sound? So the "t" sound sounds like "teh" with a big emphasis on the "eh" sound? Example: smart-eh first-eh

Answer 1

In linguistics, the "t" sound is a called a stop. If you pronounce the "eh" afterward the "t" at the end of a word, it would be described as a released stop.