smack1

noun

• a sharp slap or blow, typically one given with the palm of the hand:she gave Mark a smack across the face
• a loud, sharp sound made by a slap or similar action:she closed the ledger with a smack
• a loud kiss:I was saluted with two hearty smacks on my cheeks

verb

• strike (someone or something), typically with the palm of the hand and as a punishment:Jessica smacked his face quite hard
• smash, drive, or put forcefully into or onto something:he smacked a fist into the palm of a black-gloved hand
• part (one’s lips) noisily in eager anticipation or enjoyment of food, drink, or other pleasures.
• archaic crack (a whip).

adverb

• 1in a sudden and violent way:I ran smack into the back of a parked truck

• 2exactly; precisely:our mother’s house was smack in the middle of the city