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1.
When it's a cold day and you go outside and your testicles start to withdraw into your body and eventually go up to your neck.
Guy1: Wow it's such a cold day i think my scrotum has gone up to my neck!

Guy2: Haha, throatum.
by Jimination October 19, 2009
 
2.
the fleshy patch of skin that covers your adams apple. Guys only...
Shit, mikes got a nice throatum...
by Mark C. McKenna September 05, 2010
 
3.
The dangly thing in the back of your throat. If you touch it you'll vomit.
My day was going great until my dog licked some peanut butter off my throatum and I vomited in his mouth.
by Cole Sickler April 01, 2006