I once saw a professional guy doing this: in a normal SQL query window, select any procedure/function name, and stroke a key combination, then the definition of this object is right there in query result grid, then he can just copy the resulting text to an editor to review it.
I'm regretting not asking him, so I'm asking here right now, hopefully, someone would know how to do that, thanks!
BTW, he was using SQL Server Management Studio, don't know which version.
Are you looking for sp_helptext ?
sp_helptext 'procedure/function name'
And then just press F5 to view destination of procedure/function name in query result grid.
If you want to see OBJECT schema then use alt + f1 combination.
Redgate SQLPrompt, a third party plugin for SSMS, has also similar functionality. When mouse cursor is on top of any object a pop-up window appears with a definition of the object:

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