IPA: /ˈtɪtərər/
KK: /ˈtɪtərər/
A person who laughs quietly or in a nervous way, often in response to something amusing or awkward.
The titterer in the corner couldn't help but giggle at the joke.
Titterer is derived from the word 'titter' (originating from Middle English 'titeren', meaning to giggle or laugh nervously) with the addition of the suffix '-er' (meaning a person who performs an action). Thus, a titterer is a person who giggles or laughs nervously.
Think of someone who is giggling or laughing nervously — that's what a titterer does.