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1.
When a girl gives a blow job/hand job combo while inserting a finger in the guy's ass.

It's a very rare maneuver not recommended for new couples.
Guy 1: This girl was blowing me last night and she stuck her finger up my ass!!

Guy 2: Dude! That's a Mexican Tugboat!!
by MikeandJohn January 30, 2011
 
2.
When a man is comitting anal sex with a female. He then flips her on her back and begins to fist her vagiana. Then he countinues to stroke his penis through the wall of the vagiana.
YOu can't just pull a mexican tug boat with any one, she has to be limber and loose!
by J.P Johnson-Reed February 03, 2011