A "bun drop" is basically when a woman suddenly releases (https://tvtropes.org/pmwiki/pmwiki.php/Main/ShakingHerHairLoose) her long hair that has been tied up in a bun so that it hangs at full length.

Here's Denise Richards on Friends performing a "bun drop":
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And Portia de Rossi on Ally McBeal:
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There's a California episode of Laverne & Shirley in which the secretary of the girls' boss lets her hair down.

In the Khan episode of Star Trek TOS, "Space Seed," Ricardo Montalban lets Madlyn Rhue's hair loose over her shoulders.

Didn't Theo's teacher from The Cosby Show do that when she came over to their house for supper?

Didn't Theo's teacher from The Cosby Show do that when she came over to their house for supper?

Yep. Freaked him out when she showed up without the bun, her long hair flowing down.

Actually, she put it back into a bun, and that freaked him out again.

Let's not forget little Molly Parker and her bun drop on The Facts of Life. Season 1, episode 7.

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Yep. Freaked him out when she showed up without the bun, her long hair flowing down.

Actually, she put it back into a bun, and that freaked him out again.

You mean Sonia Braga as Mrs. Westlake:
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this is fun!