American English slang beginning with the letter A

ace===very good
He's an ace reporter who always gets a good story.

action===excitement
Do you know where the action is in this town?

airhead===a stupid person
My sister's boyfriend is an airhead.

all wet===completely wrong
Your ideas about politics are all wet.

all-nighter===studying all night
I almost fell asleep during the test after an all-nighter.

ammo===ammunition
The gun was useless after the killer ran out of ammo.

awesome===great
What an awesome sunset today.