A gamestyle commonly adopted in FPS games when, knowing where the enemy is coming from, you might wait at a doorway, corner or opening.
The technique is often wrongly called camping by newbs(and also n00bs) aggrovated by your superior techniques.
To be correctly called a tactical waiter, a player must move to complete an objective rather than staying put
Player A: I suck at COD4 i get shot every time i turn a corner
Player B: You need to do more tactical waiting

Got the covid-19 vaccine