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1.
the feeling of the vagina pulsating after an orgasm.
"You give me that Hummingbird-Heartbeat, the taste of your honey is so sweet, when you give me that Hummingbird-Heartbeat." -Katy Perry
by dottymickfly October 20, 2010
 
2.
When a male slaps his penis in a rapid fashion across the face of his partner.
"You give me that hummingbird heartbeat. You spread my wings and make me fly. The taste of your honey is so sweet, when you give me that hummingbird heartbeat. Hummingbird heartbeat. Uh uh." -Katy Perry.
by hairy hipster November 29, 2011