1. n. A civilian version of a military Humvee. Gets approximately 0.001 miles per gallon. Driven mostly by richassholes with small penises.
2. n. A blowjob so expertly given that the giver "hums", which greatly increases stimulation.
1. *guy crosses street, hit by Hummer that ran a red light*
Guy: I'm dying, call 911!
Hummer Driver: Fuck you! You scratched my Hummer! I'm gonna sue your ass!
2. Guy 1: I got the best friggin head last night! She was humming, and it felt great!
Guy 2: So you got a Hummer.
Douchebag 2: Thanks brah, I'm hoping stacey will forget about my micropenis when she sees me driving this. It's a bitch to fuel up though. I can never get more than 4 miles on a tank of gas.