bap

Etymology 1

Originally Hiberno (Irish English), of unknown origin.

noun

1. A soft bread roll, originally from Ireland.
   burger bap
2. (Britain, Ireland, slang, chiefly in the plural) A woman's breast.
3. (Ireland, Belfast, slang) The head.
   He lost the bap meaning he got angry
   Mrs Dudley came bouncing back, hand swinging, big stain on her right bap like she'd been shot or Da had got at her in an alleyway. 2014, Kelly Creighton, The Bones of It

Etymology 2

Imitative.

intj

1. (informal) The sound of a light blow or slap.
   Damian rolls Mr. McNutt over and beats the tar out of him with a series of punches, glasses on or not. 2006, Ashaki Boelter., The Nok, page 55
   Elizabeth continued into the living room and saw Velvet napping on the cool linoleum under the dining room table. She stopped to stroke her silky side and the puppy's tail went bap, bap, bap against the floor in greeting. 2014, Rose McMills, Mountain Girl

verb

1. (informal, transitive) To hit lightly.
   “Actually, I like you growling when we're in our bedchamber. It, um . . . makes me think of all the things we do.” “Oh.” He processed that for a moment, then grinned down at her. “I'll take that as permission to growl at you all the more, then!” “Wolfer!” She bapped him again with the back of her fingers. 2007, Jean Johnson, The Wolf: A Novel of the Sons of Destiny, Penguin
   She lightly bapped him on the head, then continued […] 2016, Nathan Birr, Shot List - The Douglas Files: Book Four, page 385