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4. wax poetic
To speak in a very eccletic and influential manner. The term probably comes from the usage of the term wax, which is another name for vinyl records meaning that it is recorded and musical, and poetic, which obviously refers to the stylized nature of the speech.

Yo I don't want to wax poetic on y'all about the nature of hip-hop 'cause you's minds are too ignant to comprehend the complex theories I be spittin. Ya heard?
1. wax poetic
To speak or write about something in a highly eloquent or verbose manner. Comes from "wax" meaning "grow" or "become" as in the waxing and waning of the moon, thus "to wax poetic" is equivalent to "to grow poetic." Thus "to wax poetically" doesn't really make sense, as it would mean "to grow poetically," which isn't the same as "to grow poetic."
All you can do is wax poetic on your new computer -- let me talk for a change!
2. wax poetic
To expound on something in prose like language. Wax as in the "waxing moon" means to increase, *not* originally a reference to vinyl.
She was prone to wax poetic about her childhood as a vagabond in Mexico, explaining in prose like detail how she and her mother lived out of their rusted old Chevy pickup truck.
3. Wax poetic
To wax poetic is the act of shitting on the baseboard heater and turning the thermostat up on the day you vacate your apartment.
"Hey bra, ya movin' out today?"
"Yah man, the soup is being a total dick and keeping my deposit, so I'm gonna have to wax poetic."
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