What does it mean if your crush whispers in your ear saying im going tohit that?

'I'm gonna hit that' is a slang expression that expresses an intent to have sex. Whether your crush knows the literal meaning of what they are saying, or whether either of you are ready for this, are two questions you might want to think/talk about. Without knowing more about your situation I can only suggest you be assertive, communicate your desires openly and do nothing you feel uncomfortable about. Turning to a trusted adult friend/family member may be a good idea if things progress or take a difficult turn.