siitä vain

Interjection

 * 1) go ahead, go for it, feel free, be my guest expression of acceptance for someone to do something
 * 2) come on, go ahead, be a devil expression of encouragement to a person that is hesitating, particularly to do a specific action right away
 * 3) come on, let him/her/them/it come expression of defiance
 * 1) come on, let him/her/them/it come expression of defiance
 * 1) come on, let him/her/them/it come expression of defiance

Adverb

 * 1)  on the spot, ad hoc