HYDM stands for Hope You Don't Mind. You can use it when you're breaking some bad news to a friend or lover to lighten up the mood, or you can just add it after anything that the person you're talking to might care about just to tell them not to worry about it.
i cheated on you with your brother HYDM..

i think your mom's hot HYDM..

i'm going to steal your purse HYDM..

i love you HYDM..
by nocooch_shotsplz May 2, 2009
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