Smacker (noun)

1. A loud, enthusiastic kiss.
2. A sound made by kissing.
3. A kiss.

Origin:

from the word "smack" meaning "to kiss soundly".

Examples:

1. He gave her a smacker on the cheek.
2. She could hear the smacker from across the room.
3. The little girl gave her doll a big smacker on the nose.
4. The couple exchanged a smacker before the bride walked down the aisle.
5. He gave her a smacker before they left for the party.