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a colloquialism used by redditors to describe niche subreddits thats existence users would like to keep quiet so that the subreddit won't be flooded with new users, causing a severe decline in the quality of discourse.
Person 1: have you ever been to that subreddish /r/bookswrittenbyvonnegutinthe60s?

Person 2: I haven't I'll check it out.

Person 1: Alright, but let's keep it on the dl we don't want things getting out of hand.
by Kilgore Troutfishing April 27, 2012
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Jul 27 Word of the Day
the whale tail is the shape formed when a g-string rides up high over a womans trousers
oh my god look at that butt, her whale tail is showing so high!
by garv November 10, 2003
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