noun

• (colloquial, onomatopoeia) A very light smack, blow or punch.

verb

• (colloquial, transitive) To strike gently or playfully.
  "“Better him than me,” I said while my mother fluttered her blue eyes at me and bopped me on the nose with a wooden spoon."

noun

• (uncountable, music) A style of improvised jazz from the 1940s.
  "That grand wild sound of bop floated from beer parlors; it mixed medleys with every kind of cowboy and boogie-woogie in the American night."
• (slang, countable) A good, catchy song; a song that makes one want to dance.
  "In the later years of One Direction, especially those after the departure of Zayn Malik, the boy band morphed into the vintage pop-rock group of their (well, let’s be real, Harry’s) dreams. ‘What a Feeling’ feels prescient: its Fleetwood Mac style structure laid the groundwork for Styles’ future endeavours. It’s a bop!"
• (countable) A casual party with dancing; a disco.
  "[…] their first kiss during the school bop, with Paul Weller singing “You're the Best Thing” and everything tingling from her toes up […]"
• (countable, Oxbridge slang) A party hosted by a college's JCR or MCR.
  "Theatres; Music House used for bands; May Ball; very popular weekly bops in JCR and MCR; library (57,000 books); 40 networked PCs, 24-hrs."

verb

• (informal, ambitransitive) To walk casually; to stroll.
  ""I bopped down to take Charlie out for a surprise lunch, but he's out at the warehouse doing something with somebody or something. So I'm letting you take me to lunch.""
• (slang, ambitransitive) To have sex.
  "I'm here because your wife and I have been bopping like bunnies. Here are the pictures to prove it."
• (slang, ambitransitive) To fellate.
  "Squa' said she just done the 6, now she on the ends just boppin' (Bad, she bad) Now she on the ends just boppin (Boppin')"