IBTM 

In Before The Move. Used by forum postwhores who predict a thread will be moved to another section.

In the forum section, Off Topic, a thread is made about Desktop processors. A member posts in that thread, "IBTM"

Later, the thread is mergeclocharded to the Desktops and Other Technology section where it belongs.

IBTM by postwhore May 23, 2006

IBTMOAI 

Abbreviation;

Imagine being this much of an idiot.

My neighbour voted for trump, ibtmoai

IBTMOAI by Anonymous_51821 June 17, 2021

IBTMF 

I be the mother fuker

He said IBTMF

IBTMF by IBTMF September 19, 2021