THWACK

thwack. Thwack, v.t. to bang, beat, strike hard, thrash

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Thwack (thwăk), v. t. [imp. & p. p. Thwacked (?); p. pr. & vb. n. Thwacking.] [[Cf. OE. thakken to stroke, AS. þaccian, E. whack.]] 1. 1. To strike with something flat or heavy; to bang, or thrash: to thump. “A distant thwacking sound.” W. Irving.
2. 2. To fill to overflow. Stanyhurst.