Perfectly round, perky, tennis ball-sized breasts normally only seen on 18 and 19 year old coeds.
"I haven't seen titty balls like those since Spring Break in Cancun."
1) A lazy worker who only worries about his sick time, paid time off, vacations, and any other paid holiday.
He worries more about taking time off then making money or working hard.
2) Best example is from the movie "Boiler Room" where Ben Affleck wants salesmen that want to make money, not pikers who worry only about vacation time.
Sentence: That piker will do anything to get out of work.