Etymology
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sis-boom-bah

cheerleading chant, originally (1867) an echoic phrase imitating the sound of a skyrocket flight (sis), the burst of the fireworks (boom), and the reaction of the crowd ((b)ah).

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Dictionary entries near sis-boom-bah

sirocco

sirrah

sis

-sis

sisal

sis-boom-bah

sissify

sissy

sist

sister

sisterhood