Here's NFL star Rob Gronkowski ... motorboatin' the HELL out of a pair of boobies in a South Carolina nightclub ... because of course he did.
Gronk was partying in the VIP section of Club Trio in Charleston on Sunday night -- when he dropped anchor in front of a woman holding a bottle of booze and went full "Wedding Crashers."
By the way, start to finish ... Gronk spent a full 5 seconds in between the cleavage ... while everyone around cheered and high-fived.
You motorboatin' son of a bitch ...
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