A way of expressing surprise or astonishment. Used in place of phrases including "Oh my God!" or "Oh my Lord!," so as not to offend anyone by "using the Lord's name in
vain."
Origin: Mylanta is an antacid used to alleviate symptoms including heartburn, acid indigestion, sour stomach or
gas. Thus, "My" tends to
lead into "Lanta" rather smoothly.