Your buddy is right. Chill it. Put it under 30-40 PSI, and shake the hell out of it. Then let it sit under 30-40 PSI for another day or two or as long as you can stand.
The shaking isn't necessary...you can just leave it chilled and under gas pressure, but shaking it speeds things up a lot. It'll take a week or more otherwise. Any trub that makes it in there will settle out again anyway and will come out in the first pint.
It needs to be cold for the CO2 to dissolve.
Oh don't give me none more of that Old Janx Spirit
No, don't you give me none more of that Old Janx Spirit
For my head will fly, my tongue will lie, my eyes will fry and I may die
Won't you pour me one more of that sinful Old Janx Spirit