  We predict the twist-2 Transverse Momentum Dependent parton distribution
functions (TMDs) of the pion, namely the unpolarized quark TMD, $f_{1}(x,
k_\perp)$, and the transversely polarized quark TMD, also known as the
Boer-Mulders function, $h^\perp_{1}(x, k_\perp)$, using a holographic
light-front pion wavefunction with dynamical spin effects. These spin effects,
in conjunction with gluon rescattering, are crucial to predict a non-zero
holographic Boer-Mulders function. We investigate the use of a non-perturbative
SU(3) gluon rescattering kernel, thus going beyond the usual approximation of
perturbative U(1) gluons. We find that the non-perturbative color dynamics
offer a more promising way to describe the available lattice data on the
generalized Boer-Mulders shifts.
