salad days:
a time of youthful inexperience, innocence, or indiscretion.

salmagundi:

a mixture or assortment; also, a kind of mixed dish or salad.

shiftless:

a style of writing that uses only lower-case letters.

[Example]

Cummings wrote many of his poems in the shiftless style, using no upper-case letters at all.

snow job:

An effort to deceive, overwhelm, or persuade with insincere talk, especially flattery.

[Example]

The entire presentation was a complete snow job.

sobriquet:
a nickname.

spoliation:

1. The act of pillaging and plundering.

2. Seizure of neutral ships at sea in time of war.

3. The deliberate destruction or alteration of a document.

spurious:

not genuine; false; illegitimate.

sticky wicket:

A difficult, awkward or uncertain situation.

stolid:

unexcitable; unemotional.

stripling:

an adolescent youth.

succedaneum:

A substitute.

superfluous:

more than is wanted or is sufficient.

sutler:
A merchant who follows an army to sell provisions to the soldiers.

swipeout:

When you've maxed out all your credit cards.

[Example]

I can't buy that dress. I've hit a swipeout.