A Texas Mudflap is the act of a woman (or man) lapping their tongue on the man's butthole while holding his nuts in her mouth like a greedy squirrel.
This is similar to tea-bagging but with an extra step for added degree of difficulty.
Proper preparation is to have the man's anus partially or fully shaved. A hairy butthole changes the act to "Millionaire's High Tea".
While my cock took a nap on her forehead, she squirreled up between my legs and gave me a Texas Mudflap. I didn't kiss her the rest of the night.