Andrew Yang Shoots Whipped Cream Into Mouths of Kneeling Supporter

Andrew Yang celebrated opening a new office with a never before seen method in politics ... MUCH to the chagrin of his campaign manager.

The trending presidential candidate has stayed in the race with some unconventional ideas ... but this one takes the cake. He christened the new digs in New Hampshire by spraying whipped cream into the mouths of supporters on their knees.

To put it politically -- the optics are very interesting here.

Check out the vid ... the Yang fan in a MATH ("Make America Think Harder") hat clearly eggs on the Democratic hopeful, even insisting to Yang's resistant campaign manager, Zach Graumann, that the questionable celebration is "just a joke."

Andrew gleefully partakes, but then makes the jaw-dropping display even more baffling by declaring ... "That's a full-service presidential candidate!"

Yang goes on to say the whipped cream shot is how you open an office in style, then sprays it into the mouth of ANOTHER kneeling supporter ... before Graumann pulls him away.