GR translation: On the beam

[Becky Lindroos]

I’d say it meant “right on time” or “right on the money,” or “oh so smart,” - something like that - more literally,  “right in the middle of light and knowledge,”  ?  -   and she’s saying it very sarcastically.  

Becky  


> On Dec 25, 2015, at 10:18 AM, Mike Jing <gravitys.rainbow.cn at gmail.com> wrote:
> 
> V679.7-14   “Uh, Myrtle . . .” Slothrop approaches gold-snooded M.M. a little deferent, “uh, do you think you could . . .” Jesus they run through this same routine every time—doesn’t Myrtle wish Sniveling Slothrop would cut this wishy-washy malarkey ’n’ be a man fer once! She lights a cigarette, lets it droop from one comer of her mouth, juts out the opposite hip and sighs, “On the beam,” exasperated already with this creep—
>        And Los! the miracle is done, they’re now zipping along the corridor-streets of the Raketen-Stadt like some long-necked sea monster.
> 
> What does "On the beam" mean here?

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Pynchon-l / http://www.waste.org/mail/?list=pynchon-l