"I was listening to a programme just now about what's supposed to be in and what's out".
It's a programme about what's supposed to be fashionable, hot, cool, popular etc ... and what's not.
"Didn't half give us a laugh when Betty and June from over the road dropped in for a cup of tea and a chat after".
On the evidence you've given us we can only assume that Betty and June dropping over for a cup of tea gave them a laugh. What it was that they found particularly amusing about the visit remains unspecified.
not a teacher
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