cmebasti lujvo

b1 is a pseudonym/pronoun, replacing real name b2=c1 of x3=c2 in circumstance x4=b3.

Cf. basme'e.

In notes:

basme'e
b1=c1 is a pseudonym of c2 to/used-by namer/name-user c3 (person).
datcme
c1=d1 is an alias/nickname of c2 used by c3 instead of name d2, differing from it by standard d3.