Wiktionary
rat-a-tat-tat
n. A series of short, sharp taps, especially made by knocking on a door, beating a drum, or firing an automatic weapon
WordNet
Usage examples of "rat-a-tat-tat".
They clapped and hollered while Joe rat-a-tat-tatted his feet and collided with Nancy, clip-clopped wobbly-kneed away, wavered off-balance, recovered, and kept on thumping his feet.
With the nose at ten degrees above the horizon and the power at 70 percent, she let the plane coast into the first one, but didn't get there because the pitty-pat thumping began in the intakes and increased in intensity to a drumming rat-a-tat-tat played by a drunk.