Gigaparsec
Is a measurement of distance. More so, is the largest measurement of distance there is. The reason for this is because the approximate radius of the entire observable universe is just 14 gigaparsecs.

The equivalent distance in meters is 3.3 x 10^25 meters, which could also be written as:
330,000,000,000,000,000,000,000,000 meters.
(Three-hundred and thirty septillion meters)

OR 3.3 billion light-years.
Brian- "Haha, my penis is a gigaparsec long."

Mark- "So, you're saying your penis is 2,429,669,490,000,000,000 times larger than the diameter of the earth itself?"

Brian- "Yeah, that sounds about right."

Mark- "Hm, seems legit."