A sudden, explosive sound, such as is made by a gunshot(noun)
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Use "blam" in a sentence
"Take 18 years to line up against a target and then "blam" out comes a graduate prepared for the job market."
"NOT just the "blam" and blood everywhere like you see in Doom, but actual grieving."
"All that's missing is a "blam" and a "ka-pow" on-screen -- thought there just might be one or two of those tossed into the unpleasantly ornate backgrounds without our knowing."