Lascivious

adjective.
lewd or lustful

At first this word kind of sounds fun to say, but on second thought it just kind of gives me the creeps. You absolutely must listen to the Merriam-Webster lady say this one. It's pretty sassy.

Panties

noun.
a woman's or child's undergarment covering the lower trunk and made with closed crotch —usually used in plural.

singular version here

Tinkle

verb.
to make or emit a tinkle or a sound suggestive of a tinkle.
to urinate.

ew!!!!!!!!!!!!! Worst word!
sounds like the Merriam-Webster lady is cringing saying it!

Does slang count?

I know this isn't a word recognized by Merriam-Webster and Oxford, or any other dicitionary for that matter but...

BUMB

is a terrible word. Ew I hate that silent B.

well here goes nothing.

noun.
a lazy, lay about person.

sorry no sound bite here guys.

Formaldehyde

noun.

a colorless pungent irritating gas CH2O used chiefly in aqueous solution as a disinfectant and preservative and in chemical synthesis

nasty smelling substance. nasty sounding word.

MOIST

adjective.
slightly or moderately wet

another awful word happens to be a synonym for moist: damp. I shudder just thinking about these words.

it sounds like the Merriam-Webster lady is cringing when she is saying it.