When you have a hard-on (big craving) for some Doner, which is a dinner of juicy, crispy shavings of chicken and beef atop a bed of rice, greek style potatoes and salad topped with creamy white garlic sauce and fiery red hot sauce. Sorta like a shawarma dinner plate.
"Oh man I haven't had doner for months, I have a huge doner boner!"
John: Dude, since Cindy left last week, I haven't had a good, explosive hard-on.
Joe: I got you covered dude. Have these tapes. They're pretty spicy. They show Jenna Jameson sitting on a dick then standing up, over and over, very rapidly.
"Well, I think boner is another word for mistake, like 'I made a big boner in math class' so maybe Boner Doner means 'I donate mistakes.'" - Hubie's Mom
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.