The OED tells us that it’s probably an imitative word, so hooray! We are adding a common sound-play word to our beautiful word-hoard!

• 1.064 Smash the bottles and burn the corks!
• 4.005 where they smashed among the trees far below,
• 4.020 Clash, crash! Crush, smash!
• 4.022 and the crush, smash!
• 12.091 and if we are smashed with it the better he will like it.’
• 12.101 smashing wall
• 13.002 I think I would rather be smashed by Smaug
• 13.057 since the dragon smashed the magic door,
• 14.001 when he smashed the door
• 14.015 and smashed down.
• 15.003 when Smaug smashed the mountain-side,

“smash, v.1.” OED Online, Oxford University Press, June 2019, http://www.oed.com/view/Entry/182472. Accessed 19 August 2019.