This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To strike or hit with a flat object; whack.

n. A hard blow with a flat object; a whack.

n. The act of thwacking; a strike or blow, especially with a flat implement.

n. To strike with a wet, slapping sound.

v. To whack or hit with flat implement.

v. To beat.

v. To strike with something flat or heavy; to bang, or thrash: to thump.

v. To fill to overflow.

n. A heavy blow with something flat or heavy; a thump.

To strike with something flat or hard; beat; bang; whack.

To ram down; pack.

n. A sharp blow with something flat or hard; a whack; a bang.

n. Synonyms See thump.

n. a hard blow with a flat object

v. deliver a hard blow to

"A good meaty "thwack" means the thrower needs to go hide for a few seconds."

thwacked    thwacking    thwacks   

blow    hit   

thwacked    thwacking   

thump    strike    beat    blowy   

thunk    tippler    clunk    whack    splat    whoosh    whump    thud    plop    cudgel