So.. how does drinking the queens honey turn people into bimbos?

[Rayna]

It apparently also makes them lose memory? How does that happen?

 

[UndyingRevenant]

She's corrupted therefore her milk is corrupted, high potency and a great deal of corruption causes hardcore changes

 

[Stupid_Goo]

It was the dark energies from Kasyrra's evil magicks that turned them into bimbees.

And also maybe the honey slime.

 

[WolframL]

Yeah, it's quite literally Corruption-laced honey due to Kasyrra's machinations. Once you purify the hive's honey supply, the queen's honey looses its bimbofication effect.