snicker
n. US //ˈsnɪkɝ// UK //snˈɪkɐ// snick·er
US variant of the British snigger, possibly of onomatopoeic origin, similar to Dutch snikken (“to gasp; sob”). The noun is first recorded 1836, from the verb. Compare also Scottish smicker (“to smile or laugh in a sniggering or leery way, smirk”). More at smicker.
From snick + -er.