OMD

OMD stands for "oh my da**" (or in milder cases, "oh my darn"). It is similar to OMG, but while OMG is sometimes used to express exasperation, OMD is nearly always used to express joy or surprise.

One of the Internet's most popular uses of "oh my da**" is an auto-tuned version of YouTuber Daym Drops's Five Guys cheeseburger and fries review. In the songified version of the review, titled OH MY DAYUM, "oh my da**" is said three times. If a person says OMD in reference to "cheese going ham" or "fries biting back, my man," they're likely alluding to the review.