The technical yesterday when you haven't gone to sleep yet. When it's two am, you'd count the evening as part of today since you haven't gone to sleep yet. But you can't do this because it's technically a new day. So yesterday becomes yestertoday until you go to sleep or pass out.

A portmanteau of carpe diem, a Latin phrase that means “Seize the Day!” and DM, which stands for Direct Messages. This word means seizing the day via DMs.