Webster's Revised Unabridged Dictionary · 1913

hot dog

hot dog (hot" dag`) , noun

1.
A frankfurter.
2.
A sandwich consisting of a hot dog inserted in a partly split elongated roll, usually garnished with mustard, and sometimes also with relish, sauerkraut, or a pickle. A hot dog garnished with a chili mix is called a chili dog.
3.
A person who performs a complex and difficult athletic maneuver, usually to show off his/her skill.

hot dog (hot" dag") , exclamation

An expression of delight.