An acronym for Girl I'm With (at the moment).

Meaning the random girl I'm with at the moment who remains nameless or doesn't rank high enough for an introduction.
The GIW just asked me if she could get pregnant from oral sex. -

The GIW say's "I don't get it" an awful lot.
by RockTalkFM Dotcom April 12, 2010
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Nonchalant, fun and incredibly intelligent. Mr. Giw's have a tendency to surprise in a fucking good way. They might also ditch there friends and spend extra years as an officer in the military but they've got your back and show up just enough to still be important and loved.
Trisha: have you seen Mr. GIW?

Becky: Not really. Not since before Sziget, he came back a changed man.
by NotVoldemort0 November 21, 2021
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