from the GNU version of the Collaborative International Dictionary of English
- n. A certain game of children; seesaw; -- called also titter-totter, and titter-cum-totter.
from The Century Dictionary and Cyclopedia
- Same as titter-totter.
Sorry, no etymologies found.
Of course, as fate would have it this week -- the opposition -- in this case The Braves today were in control -- riding high on the tetter-totter.