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2.
When viewing or performing acts of the best intercourse that one has ever possibly had which results in a type of nuclear explosion between the legs of either gender or both.
Man, last night i had at least 10 sexplosions each time Shanehi got on top of me and rode me while screaming for more.

by Sex Lord August 03, 2007
 
1.
The climactic end to a sexual encounter. In the case of female Homo Sapiens, multiple may be expected.
So I made the beast with two back last night, and it ended with a giant sexplosion.
by Goose September 29, 2003
 
3.
When an atomic bomb literally goes off during sex. Often followed by moaning and screaming, then radiation sickness.
Luke: "After a bloody night of mutual anal fisting I thought for shizzle I was gonna sexplode."

Sam: "Well, I'm game!"

Luke: sloshh sloshhh push

Sam: "AWWWWWWWWWWW KAboom..." (end of world due to sexplosion)
by 9000 Penises March 20, 2009
 
4.
The skittles sold in the purple bag that come in a variety of delicious tropical flavours.

They are widely known as Sexplosions because the designers of the bag put a large image of a skittle emblished with a huge "S" directly to the left of the word "Explosions" So when one originally views the text, they read "S-explosions."
"I'm gonna go get some Sexplosions out of the vending machine!"

"Hey bud, mind sharing some of your delicious Sexplosions with me?"

see also skittles candy
by chickaboomboompow June 12, 2009
 
5.
A large explosion involving in the launching of many nude people
"Man, did you see that sexplosion? I swear I saw some old ladies jubblies...GROSS"
by Poru August 07, 2005