Top definition
When a girl gets play when she least expects it.
"I wasn't even going to go to that party, but it would up being a serendipenis night -- I went home with an adorable boy."
by AP Style June 22, 2009
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug