(Ah) shucks!and (Ah) shoot!
Rur. Darn! (A mild oath.) Ah, shucks! I forgot to call Grandma. Tom: We can't get chocolate ice cream. The store's all out. Jane: Shucks. Ah, shoot! I missed my favorite TV show.
Rur. Gosh!; a mild oath. Shucks, ma'am. It wasn't anything at all. Aw shucks, I ain't never been this close to a woman before.
See Aw shucks!