A word used to make up for gaps in conversation, when the speaker is not certain what they want to say next. Can be very annoying if used excessively.

Prime examples include: er, um, erm, and uh
Person 1: What's a black hole?
Person 2: Black holes are...um...they're uh...black holes, they...erm...er...
Person 1: You have no fucking clue, do you? You're just using filler words now.
by Mickey_G_ April 15, 2019
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They're, like, some words you uh... you throw them in when you don't know what to say. Used in the middle of sentences when... um... you're trying to think of a point. Common examples are "uh," "um," and "like." Overuse of them can, like, totally ruin the tone of sentences and make you look weird.
So, uh... this is the part where I, like, put a sentence that uses filler words... um... I can't really think of anything.
by SolarSystemGuy June 5, 2022
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