Definition of "wham"
noun:
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A forceful blow.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
The sound of such a blow; a thud.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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verb:
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To strike or smash (into) something with great force or impact.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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