It could stand for In My Biased Opinion or I Might Be Objective.
In My Biased Opinion
Imbo means "in my biased opinion".
G. Imbo has written: 'Catalogue of the active volcanoes and solfatara fields of Italy'
FR in texting means "for real" as an exclamation.
ths stands 4 this in texting
imf
Call Me
Yyp
nothing much you?
Cracks me up
it stands for mate
Yes please