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Mariners fans could have a whole new way to show support for Cal Raleigh soon ... as a porn site tells TMZ Sports it's aiming to give away butt plugs to Seattle fans at Wednesday's ALCS Game 3 in honor of the star catcher.

A spokesperson for CamSoda says as Raleigh and his famous nickname -- the "Big Dumper" -- keep shining in the postseason, it wants to capitalize on the craze by doling out sex toys ahead of the Ms' huge tilt with the Blue Jays. Getty

The site tells us if Seattle officials allow it, it's looking to pass around thousands of CamSoda-branded butt plugs at T-Mobile Park just before first pitch.

"It's our way of giving fans a playful keepsake to commemorate your legendary swing and, let's be honest, your equally legendary nickname," CamSoda VP Daryn Parker s

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