(verb) to renege on plans, often without telling others involved in the plan. Similar to standing someone up, but not usually used romantically or in a dating situation.
>Lynn, Julie and I went to Tapa's last night; we had a great time
>>Wasn't Lisa supposed to meet you out too?
>Yea, she never showed up! She didn't call or anything; she totally japped.
-OR-
>Mom, you said you would come in to help me today. I can't believe you are japping on me AGAIN!
>>Wasn't Lisa supposed to meet you out too?
>Yea, she never showed up! She didn't call or anything; she totally japped.
-OR-
>Mom, you said you would come in to help me today. I can't believe you are japping on me AGAIN!
by M-No September 07, 2006