What's the meaning of macroBS and microBS?

Solution 1:

one can macroBS longer than microBS,. ." the respective verbs are to microbullshit and to macrobullshit

OED

bullshit v. transitive and intransitive, to talk nonsense (to); = bull v.3; also, to bluff one's way through (something) by talking nonsense.

1969 P. Roth Portnoy's Complaint 105 Please, let us not bullshit one another about ‘love’ and its duration.

"micro-" prefix

1.a. Forming terms in which micro- indicates small (often microscopic) or relatively small size, frequently in contrast with related terms beginning with macro- or mega-.

Thus "on a small scale, in a detailed manner, precisely. Hence, Macro- on a large scale, in general, in broad terms

Thus

to macrobullshit = to talk nonsense (to); = bull v.3; also, to bluff one's way through (something) in general or broad terms, or with reference to large scale effects.

to microbullshit = to talk nonsense (to); = bull v.3; also, to bluff one's way through (something) addressing the smaller aspects, thus, in a detailed way.