Echoic

MOBILE VA(CCINATIO)N!
Bob: The foremost division of a military or naval force when advancing —
Bobby: Not looking like moving anywhere maritime anytime soon.
Bob: Or set in order for doing so. This is the 1913th second-half
two-minute warning; a two-minute suspension of play.

GET VACCINATED TODAY AND RECEIVE A FOOD VOUCHER!
Bob: In an iconic food desert neighborhood.
Bobby: Echoic boredom near, duh. Single or double s?
BALTIMORE RAVENS HOSTING ON-SITE VACCINATION!
Bobby: What do ravens eat in the desert?
Bob: Carrion. Rich in water. Do not reach into the rat with no cheer.

NO APPOINTMENT NEEDED!
Bob: For a crackpot a stop-gap measure, oh-point-three
millileisures, a dose that temporarily supplies a need-le.
Bobby: A suffix expressyringing Repeated Nauseating Action, as in wrigg-le.
Bob: A piece of sophistory; tried-n’-true.
(Bobby giggling.)
Bob: Hey, gigster, got badge?
Bobby: Jab too great’s uh gig, yeah.
(Bob giggling.)