Flemish hitch-hiker

When one partner is performing oral sex on their knees with the recipient in a standing position. The 'performer' then closes one hand in a thumbs-up position and inserts the full length of the thumb into the partner's rectum. Giving the in-and-out motion reminiscent of a hitch-hiker.

"Sally sucked my cock last night and gave me the ol' Flemish hitch-hiker, my ass is still sore!"

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