The meaning of Pennywise tattoo is a terrible devil. Pennywise is the main villain in Stephen King's famous horror novel IT and the adapted film and television work the clown's soul. Monsters of unknown origin usually appear as clowns. They have a ferocious face, yellow pupils and thick oil paint, which make people shudder. They are by no means good, but enjoy killing children. Children are the main targets of his attacks.

In the story of the horror film the clown, Pennywise existed hundreds of years ago. He would appear in Derui town every 27 years. He is the nightmare that children fear most. Pannywise feeds on fear. As long as there are children with fear, he will appear. He can become the most afraid of every child and then eat them. Pennyworth can also wash away the memories of adults so that they can't stop or notice.

Source: @barty_red_baron