The actual value of the LAMC fluctuates depending on the relative purity of the lying-ass motherfucker in question and must be adjusted accordingly. A LAMC of .8 or .9 is only appropriate for a "part-time" or a "fly-by-night" lying-ass motherfucker, while a true, pathological lying-ass motherfucker often necessitates a .1 or even a .05!
Use a known quantity to assign a LAMC value to the lying-ass motherfuckers in your life. If, for instance, a lying ass motherfucker at your work claims he made a cool $120 in tips over the course of his shift when you spotted him pocketing a paltry $45, you can safely place his LAMC at .375, give or take a few hundredths.
Once a LAMC is established, it tends to remain fairly constant, varying only in cases of extreme mental excitement, anguish, or upheaval. Lying-ass motherfuckers who are manic drunks, for example, often require a lower LAMC value when they are on the sauce. Tears in the beer, however, can indicate that a higher value should be used ("in vino veritas" rings true, for depressive drunk lying-ass motherfuckers at least).
A final note: the LAMC only applies to numbers which the lying-ass motherfucker has motive to inflate (like the number of people it took to beat the shit out of him last night downtown). For instances where a lower number would seem "cooler" (such as the number of statuatory rape charges on his permanent record) a Reverse Lying-ass Motherfucker Coefficient (RLAMC) must be employed. The RLAMC will be covered in a later article.
Joe: Man, fuck that noise. You know that Jacob's Lying-ass Motherfucker Coefficient is a good .25 easy. He drank three beers, cried for a while, got Tina's voicemail, got ten other girls' voicemails, watched TV, and then passed out on the couch, which is where you found him when you came in.
Andrew: You're right, man. Dude's a lying-ass motherfucker. I don't know what I was thinking.