The phrase 'pro tip' means a pro is giving someone a tip how things really work. The 'pro tip' in this case would be that I am full of bunk. A 'looser" of the first order. Playing with the tip of my 'left tongue' is somewhat easy inside my mouth when I do not touch anything and keep my mouth slightly open. But when I come into contact with anything I tend to switch to the 'right tongue'. I have been trying to keep in the 'left tongue mode as I gently contact my left teeth and lips as I extend and retract the tongues. The left eye feels to is affected when I move the tongues left and right while in the 'left tongue' mode. There are no muscular connections so I do not understand exactly what is the process.