Tiggy in my school was a game with a group of kids and one of them was chosen to be "on". He would then have to catch up with the other kids and touch them or "tig them" and then they would be on his side to "Tig" the others. The last one "tigged" was "on" in the next game. To play tiggy with hammers I would presume was instead of touching the caught kid you would hit him with a hammer which would only happen in a rough area.
Bill