A slider is a small sandwich, typically around 3 in (7.6 cm) across, served in a bun. The term primarily refers to small hamburgers, but can also cover any small sandwich served on a slider roll.The term, when used in reference to a small hamburger, refers to a small hamburger patty served on a small bun.
Or a White Castle, which could be the real culprit here.
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And, any hamburger not cooked to 160 degrees will give you a slider you will not soon forget.
If you eat the burger undercooked, make sure you have plenty of Charmin around the house.
Plenty!