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1.
A general term to refer to someone who is lesbian, gay, bisexual, transexual, questioning, intersex, etc. The degree of how far "under the umbrella" a person is indicates the extent of their homosexuality; for instance, someone who is bi-curious would be described as a little under the umbrella, whereas a flamer would be deep under the umbrella.
Jesse (in Forever 21): That guy is so far under the umbrella, you can't even see his head.

Jef (in Forever 21): I'm pretty sure every guy here is at least half under the umbrella.
by Appoggiasaurus February 02, 2011