According to the search results, "boofing" is a slang term used to describe the act of inserting drugs, most often in tab form or powdered ecstasy, into the rectum to allow for better absorption of the substance. This practice is also known as "plugging" or "butt-chugging". It is important to note that this practice is dangerous and can lead to serious health risks, including overdose and infection.

It is worth noting that "boof" can also refer to a knock-off or illegitimate imitation of a name brand item, most commonly used with designer clothes or jewelry. However, this is not the same as "boofing" as described above.

In summary, "boofing" in the context of the Urban Dictionary refers to the act of inserting drugs into the rectum for better absorption.