Quiz: Remember the definition of mal de mer?
"easy winner" (especially in politics)," 1939, from earlier sense "horse that wins a race by pre-arrangement" (1928); the verb phrase shoo in in this sense is from 1908; from shoo (v.) + in (adv.).
Surely; certainly: but Tip (a peaceful Nubian sho-nuff) settled his beef
[1880+; presumed black pronunciation of sure enough]