What is the meaning of bonk?

verb

• Have sexual intercourse with.
  • usage: "This student sleeps with everyone in her dorm"; "Adam knew Eve"; "Were you ever intimate with this man"
  • synonyms: sleep together, roll in the hay, love, make out, make love, sleep with, get laid, have sex, know, do it, be intimate, have intercourse, have it away, have it off, screw, fuck, jazz, eff, hump, lie with, bed, have a go at it, bang, get it on
• Hit hard.
  • synonyms: sock, bop, whop, whap, bash