"Dude, why don't you just resign from office, from orifice, rather, and go get a whatchamacallit, an eggroll and an unfortunate cookie and eat it," the caller said in the voicemail.
Yee found the voicemail threatening because he also received faxes the day before with a pick-up truck dragging a noose.
"Anytime anybody makes a threat to your life or anyone who suggests your demise...What it does for me is embolden me that I'm going to continue and fight and stand for what I think is appropriate and right," Yee said.
Yee took on Limbaugh for mocking the Chinese President last week during his White House visit. Because many Chinese-Americans found it offensive, Yee demanded an apology, but Limbaugh refused.
"When you have a person like Rush Limbaugh thinking that it's OK to mock and to ridicule and to laugh at different cultures, then you are now allowing children to think it's OK to do that," Yee said.
Yee was similarly targeted last year when he demanded that Cal State Stanislaus reveal how much it paid Sarah Palin to be a keynote speaker.
Investigators of Democratic Ariz. Congresswoman Gabrielle Giffords' shooting are also looking into Yee's faxes because they are similar to the ones she received.
The Senate Sergeant at Arms cannot discuss the Yee case for security reasons but says senators receive, on average, two threats a day. He says he recommends for senators not to discuss the threats publically because it only encourages more threats.