razz

(US, slang, idiom) To impress somebody.

(transitive) To confuse or overcome with glamour or showiness; to dazzle.

To seduce a love interest; to attract someone using rizz.

A dated American idiom meaning to impress or excite someone. 'Razz' here is used in an older positive sense of stimulating or thrilling, while 'berries' is early 20th century slang for something excellent (cf. 'the bee's knees', 'the cat's pajamas'). The phrase has a Prohibition-era jazz-age flavor and is virtually never used unironically in contemporary speech, but it captures a very specific mid-century enthusiasm.