The dreaded high-waisted bikini strikes again!!! Just days after Taylor Swift terrified the nation with some grandma's dusty old swim-diaper ... Snooki subjected her OWN DEFENSELESS CHILD to the horrific ensemble.

The pics were snapped Monday on the beach in Seaside Heights -- aka "Jersey Shore" mecca -- and luckily, Snooki's baby daddy Jionni LaValle was there to distract 11-month-old Lorenzo for long enough that he didn't go blind.

Gotta hand it to Snooki though ... aside from the bikini, she looks great.