caked their trunks

To back out of a stressful situation.

A few newbies were planning on surfing but saw that the waves were massive. A passerby on the beach came by and asking if they were going to surf, then a "friend" of the newbie surfers said "these two caked their trunks the second they saw the waves."

assed up

Rubbed ass on something such as during sex.

As the woman was passed out on the chaise lounge by the pool and rubbing her nose into it, another woman said "if she only knew how much Ron and I assed up that chair the other night."