deprecate ass_grab

BUR #26352 has been approved by @nonamethanks.

deprecate ass_grab

ass grab encourages taggers to be lazy and not use either grabbing own ass or grabbing another's ass, as demonstrated by the 16,000 posts in ass_grab -grabbing_own_ass -grabbing_another's_ass.
I don't see the point in having a tag for something as simple as grabbing_another's_ass or grabbing_own_ass
We should deprecate ass grab so that users are encouraged to tag precisely.

This bulk update request is pending automatic rejection in 5 days.

This bulk update request has been rejected because it was not approved within 45 days.

The bulk update request #26352 (forum #281001) has been rejected by @DanbooruBot.

BUR #28355 has been approved by @nonamethanks.

mass update ass_grab (grabbing_own_ass or grabbing_another's_ass) -> -ass_grab

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The bulk update request #26352 (forum #281001) has been approved by @nonamethanks.

The bulk update request #28355 (forum #291969) has been approved by @nonamethanks.