"Bamf", in the Marvel Universe, is an onomatopoeia relating to the superhero Nightcrawler and the resulting sound he makes when he teleports.
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In Uncanny X-Men #153, Kitty Pryde tells a fairy tale to six-year-old Illyana Rasputin, which includes a race of creatures called "Bamfs", described as small versions of Nightcrawler even wearing a costume identical to Nightcrawler's.
They have also performed covers of Sean Kingston's Beautiful Girls, T.I.'s Whatever You Like, Smash Mouth's All Star, Reel Big Fish's She Has a Girlfriend Now Cee Lo Green's Fuck You and Nicki Minaj's Superbass.