To explode in a particulary amusing and inopportune way.
Bob: Jeffery, I need you to fill in the reports on the- *Asplode*
To appear or enter a thread in an over dramatic and over the top manner.
Often followed by *Poof* to signify appearing in a puff of smoke.
Originated in the Red. Vs. Blue forums.
Poster 1 - I AM APPEAR!
Poster 2 - Holy shit, where'd you come from?!