I always suspected it; it's a maggot in the brain and nothing more; what a rotten lot of people!
She's got some maggot in her brain, and she wants to air it.
Front region of maggot of Blow-fly (Calliphora) showing diagrammatically the imaginal discs, which are shaded.
He staggered to his feet, and saw that his visitors were the two villains, maggot and Bloodhound.
He had seen a great vision and was as a god, and he could feel only profound and awful pity for this maggot of a man.
maggot explained how he had obtained the jewels, and then asked what they were worth.
maggot led the way, and he walked straight to the old shaft where his hopeful son lay.
When grown with the former, they are said to be less affected by the maggot.
The maggot isolates itself to the best of its power and withdraws from the garish day before contracting into a little keg.
My aunt Jane would not come for some maggot or other; and as for Jem!
late 15c., probably an unexplained variant of Middle English maðek, from Old English maða "maggot, grub," from Proto-Germanic *mathon (cf. Old Norse maðkr, Old Saxon matho, Middle Dutch, Dutch made, Old High German mado, German Made, Gothic maþa "maggot"). Figurative use "whim, fancy, crotchet" is 1620s, from the notion of a maggot in the brain.
maggot mag·got (māg'ət)
The legless, soft-bodied, wormlike larva of any of various flies of the order Diptera, often found in decaying matter.