Wiktionary
n. 1 The act of travelling in a motorboat. 2 (cx slang English) The act of placing one's head between a woman's breasts and making the sound of a motorboat with one's lips whilst moving the head from side to side. vb. (present participle of motorboat English)
Wikipedia
In electronics, motorboating is low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones. It is a problem encountered particularly in radio transceivers and older vacuum tube audio systems, guitar amplifiers, PA systems and is caused by some type of unwanted feedback in the circuit. The amplifying devices in audio and radio equipment are vulnerable to a variety of feedback problems, which can cause distinctive noise in the output. The term motorboating is applied to oscillations whose frequency is below the range of hearing, from 1 to 10 hertz, so the individual oscillations are heard as pulses. Sometimes the oscillations can even be seen visually as the woofer cones in speakers slowly moving in and out.
Besides sounding annoying, motorboating can cause clipping of the audio output waveform, and thus distortion in the output.
Usage examples of "motorboating".
There were rotors and loud planes motorboating in the gray sky outside, but it was always quiet in the humid heat of this garden.