Set FL_NOTARGET on yourself when the taunt is activated, and remove the flag when the taunt ends. I use a similar method in Friendly Mode.
The FL_NOTARGET flag causes a player to be invisible to sentries and immune to airblasts, among other things.
Until someone actually creates a plugin that auto-applies the flag when that specific taunt is used, this plugin may help you:
https://forums.alliedmods.net/showthread.php?p=1422495
EDIT: MOVETYPE_NONE will probably have less side effects. Probably.
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