blam

Etymology 1

By onomatopoeia.

noun

1. A sudden, explosive sound, such as is made by a gunshot
   He kicked in the door with a blam.

intj

1. A sudden, explosive sound, such as is made by a gunshot
   That the last zombie? Here. Let me get that for ya. *BLAM!*

verb

1. (intransitive) To fire a gun.
2. (transitive) To shoot; to kill by gunshot.

Etymology 2

Blend of blog + spam

noun

1. (Internet, informal) spam posted to a blog
   […] we refer to unsolicited and unwanted advertising as spam. The phenomenon is widespread, and has led people to coin terms for it in other information product or service contexts, such as splog or blam (unsolicited advertisements in blog comments), spim (instant messaging), […] 2012, Martin Peitz, Joel Waldfogel, The Oxford Handbook of the Digital Economy
   To counter this effect, spammers attempt to create links to their sites on other people's pages. The most common targets for this kind of spam are weblogs, the spamming then being known as blog spam, or "blam" for short. 2014, Nicolae Sfetcu, Internet Marketing, SEO & Advertising