  We report the detection of large variations in the outflow wind velocity from
a young eruptive star, V899 Mon during its ongoing high accretion outburst
phase. Such large variations in the outflow velocity (from -722 km s$^{-1}$ to
-425 km s$^{-1}$) have never been reported previously in this family of
objects. Our continuous monitoring of this source shows that the
multi-component, clumpy, and episodic high velocity outflows are stable in the
time scale of a few days, and vary over the time scale of a few weeks to
months. We detect significant decoupling in the instantaneous outflow strength
to accretion rate. From the comparison of various possible outflow mechanisms
in magnetospheric accretion of young stellar objects, we conclude magnetically
driven polar winds to be the most consistent mechanism for the outflows seen in
V899 Mon. The large scale fluctuations in outflow over the short period makes
V899 Mon the most ideal source to constrain various magnetohydrodynamics (MHD)
simulations of magnetospheric accretion.
  *footnote: based on observations made with the Southern African Large
Telescope (SALT)
