To come on to somebody sexually when the person you are coming on to doesn't really want to have sex. usually when you mistake innocent intentions for sexual innuendos. ending in either the person yelling RAPE!! or the whole world laughing at you cause you thought she actually wanted tohave sex with you.
"Joshua jumped the muffin last night when lindsay asked him to come over and watch a movie with her"
"Damn! nate just jumped the muffin when brittney told him she liked sausage"
"dont jump the muffin nate, she just wants to hang out."