Q) Which of the following meets the FCC definition of harmful interference?
A) That which seriously degrades, obstructs, or repeatedly interrupts a radio communication service operating in accordance with the Radio Regulations.
A "lid" is an amateur radio slang word used to denote a poor operator. Causing harmful interference on the amateur bands is a sure way to gain a reputation as "lid". It is also an effective way to receive a notice from the FCC with the possibility of a $10,000 fine.