Yawn

[PussyCat]

Involuntarily open ones mouth wide and inhale deeply due to tiredness or boredom.

[Mark Zuckerberg]

The only time some [married] men ever [get to] open their [mouth].

[Rihanna]

The single most [contagious] thing in [the known universe]. Can be passed from person to person by [the mystery] of F-Gas.

[Lanell]

what you do when youre [tired]. usually occurs in [math] or school in general. [contagious] to two people.

[Hina Muqadas]

A common sign of lack of sleep or boredom. It erupts from your mouth, kind of like a weird [moan]. Very [contagious]. You could experience a series of yawns just by seeing, hearing, and or thinking about [yawning].

[Kai]

A biological [mechanism], commonly of mammals, used to [restore] oxygen to the brain when [fatigued].

[Luis Fok]

[An act] of [sucking ghost dick].

[Lanell]

When youre tired, and your [jaw] opens and you let out a [gust] of mighty [man wind]. Sometimes it sounds like a fart, but it works...Kind of

[Zipporah Schumaker]

When stopping somebody telling you about a REALLY BORING story that you [dont care] about with the word [YAWN].

Quite a rude term, think about before using.
[Drag out] for extra effect.

[Justin Bieber]

A person, place, or [event] that is [found] to be [boring].