Chocolate Eclair is when you bust in a girls face the right after that you procede to take a shit on her face and then mix the cum in with the shit and you have yourself a chocolate eclair
After engaging in anal intercourse without a condom the male climaxes then pulls out his genitals and notices a fine line of excrement on top of the shaft of the penis with the ejaculate resembling cream.
"Last night with shelly things got a bit wild and I ended up with a chocolate Eclair, yup a bit of the ol poopoo on the peepee"
When you take a nice, long, hard shit and hollow out the core so you can then masturbate into the poopy. This resembles a chocolate eclair because the poopy is the outter chocolate donut and the semen on the inside is the pastry cream.