An Aptronym - or euonym - is a name which uncannily suits the owner's occupation. Think Tiger 'Woods,' golfer, or Usain 'Bolt,' sprinter. By this logic, what is the trade of my Irish friend, Philip McAvety?

When you’re anxious ants go here, when your dog is exhausted it does this.

One: You gotta hit me on the head, literally and figuratively, for me to be effective. Two: Bite me to appear nervous or paint me to appear well put together. Three: Use me as a colloquial way to celebrate an achievement.

sweet as can be, you'll have to undress me

A behavior you are better not adopting. Added to president and, perhaps apocryphally, it is not worth a warm bucket of spit. Change the first letter to n and it is praise for a riddle well written.