  We propose an axigluon with mass between 400 and 450 GeV and flavor universal
couplings to quarks to explain the Tevatron t-tbar forward-backward asymmetry.
The model predicts a small negative asymmetry for t-tbar pairs with invariant
mass below 450 GeV and a large positive asymmetry above 450 GeV. The asymmetry
arises from interference between s-channel gluon and axigluon diagrams and
requires a relatively weakly coupled axigluon ($g_{a} = g_{qcd}/3$).
Axigluon-gluon interference does not contribute to the t-tbar cross section.
New contributions to the cross section arise only at fourth order in the
axigluon coupling and are very small for a sufficiently broad axigluon. Dijet
measurements do not significantly constrain the axigluon couplings. We propose
several possible UV completions of the phenomenological axigluon which explain
the required small couplings and large width. Such UV completions necessarily
contain new colored fermions or scalars below the axigluon mass and predict
multi-jet events with large cross sections at the Tevatron and LHC.
