Top Definition
1.) a dense puffy type of cloud, usually consisting of concentrated DUMB having a dull face and retarded outlines often piled up like an imbecile.
2.) a person who actively seeks to rain bullshit upon persons lacking a dumbrella.
3. Something so unquantifiably awesome that it can only be appreciated by the momentary retardation that witnessing it results in.
1 & 3) "Wow. That gaggle of oompaloompas just tried to sell me hamster insurance. How ridickulumulus is that??"

2) "No, considering you've tried to pull that one on me multiple times this week, I would say that YOU are ridickulumulus, dude."
by Matthew Heflin March 06, 2008

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

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

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt